diff --git a/2023/day01/default.nix b/2023/day01/default.nix
new file mode 100644
index 0000000..40536dc
--- /dev/null
+++ b/2023/day01/default.nix
@@ -0,0 +1,72 @@
+{ pkgs, lib }:
+
+with lib;
+
+let
+  input = pipe (fileContents ./input.txt) [
+    (splitString "\n")
+  ];
+
+  answer1 = pipe input [
+    (map stringToCharacters)
+    (x: {
+      forwards = x;
+      reverse = map reverseList x;
+    })
+    (mapAttrs (_: map (findFirst (x: builtins.match "[[:digit:]]" x == [ ]) null)))
+    ({ forwards, reverse }: zipListsWith (a: b: a + b) forwards reverse)
+    (map toInt)
+    (foldr (a: b: a + b) 0)
+    toString
+  ];
+
+  letterNumbers = {
+    "one"   = "1";
+    "two"   = "2";
+    "three" = "3";
+    "four"  = "4";
+    "five"  = "5";
+    "six"   = "6";
+    "seven" = "7";
+    "eight" = "8";
+    "nine"  = "9";
+  };
+
+  reverseString = s: pipe s [
+    stringToCharacters
+    reverseList
+    (builtins.concatStringsSep "")
+  ];
+
+  # NOTE: builtins.match somehow always matches the last group first.
+  #       I believe it might be an implementation detail.
+  answer2 = pipe input [
+    (x: {
+      last = pipe x [
+        (map (builtins.match "^.*([[:digit:]]|${builtins.concatStringsSep "|" (builtins.attrNames letterNumbers)}).*$"))
+        (map head)
+      ];
+      first = pipe x [
+        (map reverseString)
+        (let
+          rLetterNumbers = map reverseString (builtins.attrNames letterNumbers);
+        in map (builtins.match "^.*([[:digit:]]|${builtins.concatStringsSep "|" rLetterNumbers}).*$"))
+        (map head)
+        (map reverseString)
+      ];
+    })
+    (mapAttrs (_: map (x: letterNumbers.${x} or x)))
+    ({ first, last }: zipListsWith (a: b: a + b) first last)
+    (map toInt)
+    (foldr (a: b: a + b) 0)
+    toString
+  ];
+  
+in
+  pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''
diff --git a/2023/day01/input.txt b/2023/day01/input.txt
new file mode 100644
index 0000000..f888ae8
--- /dev/null
+++ b/2023/day01/input.txt
@@ -0,0 +1,1000 @@
+8eight1
+98126
+fourfourthreehnbhkmscqxdfksg64bvpppznkh
+8fivenvvtrlj
+six3zbhvrfhsevennine
+427nine6chnqrssxfour
+threevvxhvx38rktdqm3
+eightzgqzr3eight
+xgjjmnlvznf2nineltmsevennine6
+ninethree15seven
+37cjnsfbfkqpkxpdvgk8
+sgeightwo3
+9sbxg
+1spnthree59ninejjgjdlx
+six9six2gxmn
+twothreefdbl6five3zcqvcqxkcvdfkl4
+46six47seven27one
+four15
+7sixvmsrrzqnngonethree
+3fvsghvkqkbfivenine
+zhthfghk6ppc48bdx6two
+1fouronesixsvhbglmvxx
+7lcsixmzmseven
+two37sixccrpqngpvthree
+86fivelqmlmbnhq
+bvcz4
+6fivendr7seven31nine4
+jmkhtgklhpxxblc2slhlnfkoneonefour
+8smpnsc29threesix
+r795vgnhqhs92one
+eightfive6
+4threeqzslpcvkpfdjh
+8cthp65
+twoonenine87
+dzttdmpfxtnine6onefourone3vnnz
+8tnnfrsdffpthree67xh
+seven5seven27hf
+3sevenone
+seven9foursskfhnchhf481
+vrfbrcsgp81vsztr
+six9dnqqgxtvrngpz7879two
+lkvzzdxmr71lglsixfour
+two6jkpz9
+1sevenpmjfv
+nlvrdmdhxsix7three7frmdlckfjninesix
+gfb89qrhtzsfvbnpbp6two
+f8mbbtzjvrqkrszlgrlzrlrgmbmmrdqv8seven
+sphkkpptpvjzbflkzz2vbndc3foureighttbn
+eightnine5zpbzhltpmsxrggdcmbrzkvczqbfsevendtjsr
+2snpbrhpnine3sevensevenhftpqgk5
+seventjxr91sevenseveneightwojf
+1hfkvhjxrtjfivefive
+3fxgmlxtwo
+stwoeighttwo3
+eight45t
+sixthreecdhbfive3sevensrskjm
+fiveklmj94sixlhpfztlk95
+fivefive6
+fiventjm7tndhd57
+teightwo87nine83
+6jskjmxrttwo93four7
+dftzgsdc19threesevennine3twonevl
+zmpcgkonethree1cspnkkpjr9
+hmsfrjtxpgn9dqkr9dqvrtq4
+3eightmfggjleight
+qfglzvvrrtpfl4
+7eightonefpqq3
+tgtbsmpftwo4hvnvsixfrdqbvqbhspcczfhvqcslvfszvrtzbks
+twofivesix34nine
+dhlhkjcjsbgnxd6sgrdnzchtxtplltbqlk
+oneonegcndlfourdngmbgdeightsix2
+twotj9l8onetwoned
+jpz2fourjgrjzf44
+9fivesixmlqr8rxqpvpfzfive2nine
+6xkfkrfnine196
+four7gppqtzvbftzcbzt8nqq1nineqdlrff
+2threekxgcqjzt4qdbthmjx
+three61eightrnkckq
+9knfvqgmdsmdqlkfzl
+mxsqv6twojgmhpmlfq
+7fouronelngndbsmljbfzmsix
+fjm8fdpnlldlgvkqdcdcdjpxzdt
+7five2
+tsp9seven
+eight2hzpkpqrjgcrnxksix
+jfourcgjbpzbgdn61dzqbgthree
+7threefive
+1ncmzhqghthree3sixllvknhf
+one5six9
+krzkzmbccr1
+74mqnzmqnf6
+four9pfhjktmvxtwo
+6bl21bpx2
+4threefdpfqck
+jjksjbsjlgdonefour5
+2hbthreegfh1
+threegzbn1four4hbqkmtmoneightrhg
+fiveeightnine83
+3five49jvrhvmnjmmzlzmhpbpsfpn4
+3vvhshsixone3
+55three7svtlzzggkqjhjx
+fxdmnjsvpjbg69gcknlzgrqhqdsxvk3p
+eightfcnmbzl2jhlklgmlmsevenkjbgzhstwo
+6sevengdmtlfjmns63
+ktgqthreedfmrpdvnkfvs3jsgcvtdkh
+4seven1
+34onexkninex6pnldxrfs
+threenine3five9eightrvg9
+xqbnmtrlsjninenine57rpcsjpqfdcbd6
+216two
+xhrdmfcvjzt4sixfkjsvkfhtldfqckj
+2six8zeight1
+cmpklgjgf19twoqstfhphbxxtfdgj2
+lvgqnkqhltwo9r
+twosevenfive2rgfsgmzqjbnine
+7ddpjxmfschtqdgnjqc18one
+oneninefiveeight6
+qs4five5
+rpxbcff9vpmlvvrlonefourdnczqzjbvnine3
+7592r3qjtwothree
+sixtwoninegzrfp9hq6six9oneightp
+f8seven1dcrjqchxchfour8
+bnhmfmsbzbhfive1rfqqkzkptjnnxpone2jqhrfnvkfk
+qlhpvzdkcfsq84
+dfour5one
+hcvxnfm32kpzxkhvmvkjsevenllpjpgdhl
+dlhhnk2ctvxqmbmsc9five
+one7sevenninesix
+two4rkb5sixtx17
+28three7
+msixeightnqmtfmtftsix9
+zff8nineflfpz1six1
+vk9
+86ninelzskddf9784
+mrntnhjrvkjgmntone715ktgb7
+sevensixthreegkldpptbmteightsix2nfnljvkfkgc
+nineonenine3ssnjhkhdplvq3six
+jrdgsz8
+5nine6bglkndgfnineq
+nineone8seven5zhdd2eight
+17qjzvtwo
+4rncnvtp5ssznhncdnnzndr9
+6srf
+5two6xxkzdrbfsix
+five314sevenseven
+eightsix7lhfqone
+gdz3one
+6sdplqg
+rsnnm3twoqlxjjvzeightvxszxhmnck
+7onelvrtdktmcmrm55
+1eightzvcgfqgfh
+ssgrzpb6jntxrdhvmrkeight
+5oneninetwo
+gjktwopxxql4gxfourseven9
+four55sevenvglcrqsdt
+nsqrjfhs2eight
+seventhree5g9
+threehvmrmvglvvsix7pqxzfjvv
+cfgfmgg5vmqnnqrxdxone35
+two2fxsmdjmb
+rrlxrkjkxmfrbvxsevenrlllvclhvvfourlp4seven
+djdoneightthree82eight6five6
+two4threecdbgnmzvdd53oneeightkmx
+one5qdtnrpcmrnnsbeighttwotwoninegtpv
+86htqkfrkmone217
+onelqd5jvlbm4
+eightone3rpnkglzfcveight12one
+fourqfxndmpgbqrcpclbnn86hxsxqrrkjcgtgxbdxjdjlzcrhkp
+1one18tjcsjzpmzmpmstzmcn9
+threesevenpgt3
+four9sixthree1
+twoninethreesxxqgqlqmqxkmkl2qdrqpftwo
+seven678
+two29six958kqxq3
+dbpjzgdrhnsixfjvs9eightsjdgtckdtsjmhplkjeightwodd
+7fourninenine
+fourthreedlhf9rf
+mjkvfivekltmfourone2
+7twozrrtg498one
+4eightcxnx
+one62eightdktgeight2five
+bnpxcdxpzp4tklvsm
+d8sixninegrbx
+threefourfivetwo23
+nine3onemqtbrhlp8jqslv66ssjrkh
+1four9fournine2
+xfsl83two4
+65twonine
+1twofivevctxpfvr18
+819gc4six79
+27vtvmsix1phzrone2nine
+boneight1mskkndkgfive
+1xmpkmg3
+one8sixthree9zjtmqjjjtc1nine
+six36gqjctdsevenlnmmbr7dplrsdptwo
+8jjvgmffgxr5
+fivehgkc5
+2qmbvphfivexggrxljhj9qmjrzmrx8eight
+3rndntwoseven
+boneight6tworgxffournine
+htbvm1grtsgdgbl
+1hkndcqv
+32sl9six9
+894
+vrhxnstqqmflm6glgfnpfour
+5ninekrfivesix8
+5six5
+eightpdzjhvbgm5oneonetwothmnkflz
+vnfttnhcs892rmpvjvqvfftmzlkcrzthkbhfour2
+9twoeight
+73553bkzzhq
+fvxmvs47
+3bhmjpqvzs
+pcftqc671
+sixtwo8
+threesdhhzmxtzpsfgs286nmqpvrtkbktcblqqb
+7pmhlfcmdxthree11gxpncfqntjtwoone
+8fivel3sevenxqtpxjntbjbtxhxtqdfnfour
+6seven72zzseven
+seven9kcthreetwo2five7br
+kvkhl1fzvpseven
+5oneoneeighteight6
+lvfx6onefour
+ftjzq4
+slbgthc5xsxvplbskk
+64nkjjvrmsqzdone
+twoonelgcnrmrm52
+gnfmrdkzoneseven7twotxgsjsix1one
+1xlrpbbdbdgftkd
+8jmphpvclbf87two
+724threesixthreetwozsix
+bcxdnrd91cprdfcqfive
+zxjcgbhfr3
+scfklbckxjggbgz9txqnzf6
+1twohctsdfkgsdteight2
+7threethree
+jdj9
+99
+sixfzv24nine2bz
+onefour1frf79tcfjchqeight
+onethreenkgjgtpxfkmncvmsqs2bsqppgg
+fourfourtksqrmnmqfour351lrsnv
+6559hthdpeightkfive3
+sixone7
+eightoneeightjcsggnqthree5qqmp
+sixeightonegltz7
+three4plz3kls
+8sixmssvtthreeseventhreenskzq6
+tbzxjqxkspseven9dtbqvchseven8mbpznrrh1tdmqs
+1b7eight
+thk23eightfivekvzphvmsfour
+7cnlrjzvk66threefxzrtgrbvmbp
+bhvponeonefouronedcstbnl8
+eightninesix4fourbrpfp
+four29eight
+kqh5zkgqphzjvz
+4zvh
+fivesixnzbsvfjhj2
+rkrnbpsqjdthreez78mg
+eight4gzxfdjpnjnskzghlzfdmjhz
+seven8fourxzdmlcq1mnine7qbblrqtrsq
+gd369
+hgtqgfive8
+pcbgddgvvzpmone4onethreeoneonefive
+95nnjhmhrqgkkstwo66
+723sixone9threefiveone
+threekfvqsscfjr8
+3vzltxllq65jvthree
+4977d
+35pgnlsjjpbgseven33
+g25twonineeight
+three8eight3six
+8five8vjnzglnrbsbxmjqzfvrsoneightlpx
+3bksdkncgtmdrlvkgboneffkszhfive8
+five1hfh6
+fourfoursix2nine9t
+6onetkhqqonetwo
+26hdfljh8
+6onethreefvgnoneoneninefour1
+jghct6rzcbjsfivefourtsrbsjkgmtfive
+nine93eightxqknsqhrmjthree2
+fivenine44sixsixlxdkpm
+threeeight16jjhdkbhlninekvdvlpbq
+onethpbzthhlqxnlrmtwo8
+seveneight1eight
+5two8
+4four8vdpmqvf3onenmfg9
+eight9jtxgdzdrtwovznpmnqvnnlffsix
+456four
+9hxkq
+713kthreexfbdrtbx
+1five59
+1mxpmfive63
+sixfour1ffivezjj
+97eightthreecjnxblrnine
+kgqcxfzc4sixnineoneone3eight
+9fbklklqqsfourbfhmfmgnbtls3three
+xxjnbdxzeightjqvvd82kfchrthmgkfive
+zfdeightwokbq3seven
+6four696ninezfhrbg
+zrznfshdvlxcstqtghjnjvxq1dlklzghbh
+steightwoxfbfzlnzvlj7919four
+nine48oneeightseven89five
+ninesxtdnjkmg7rn32qdljqprj3
+five6xkcg1qmpkddfbsnlhzltlqqjr8
+99sgptmns4five
+2ninejdstk
+gvclfcg9
+n9lmv
+jrftwo3
+sxrxlnvdhr47dppck
+jvtwonesixlzdshrfjtzgqddsix7
+7peightoneeightwobsc
+three6txdjgqqmsdeightcxmljmmzxksseven
+fqpx9three96xrvjvjjnrhknsvfour
+9fournjmslzbmx34cnt
+f3twovfc
+shbtwone3kzdsdrxgr
+4five1tfhvd27
+rdccbvkr9gjsmxhfdzgvjcbkdmsdeightlvjkdgtdqmbvscvhpmdz
+pzsqhqthreetwo1qxfbhreight
+threeeightxonenineninepmjfgzsdhd1
+nine7sevenone
+hbsqqtlqcxkjjccmmpv5
+6nineltr5plmbgzfqbxninerxzbzrblmfsmjggvr
+5eightwolxp
+5cscpfqm
+four3nthbmbxfbvtrqqkfmltmtjh
+pvxtx89jp9onesevennbxmjlzmfk
+threetwoeightzcgkbv1
+7rxxfpgvl3eight8dmhkf
+nine6two
+tpnr21five1eight
+ktsx6threeseven
+8four31drvszglmv
+fgkmbcgsrjgs6eightfivefqqdksrndrtdbsxgmfgtggmrc
+sixnineninefzvthdq5tkzrhrgdqblzndmv
+7lfdrntqsm
+seven8dgxgqvgvmtdkhqsfkhtqcjpvqlfnine
+znltfour6twopsdmcthree
+oneeightvvvxxptmk4eight2n
+5six1jmmqtknpveight
+eightsixxxpbvqhpknz27mqxvf
+rbdchcmqhseightnine9
+944five8gxsjf98
+smdhcnbmone9
+one64six
+seven4fivesevenfournine
+fivetjt27qqxncqcone
+five49655onet5
+mlqgmhfgsix3two2
+jxdfkbvdgnjqznineh1rdqsv7
+fqdvcktwoeightsixsevenkkczb3
+3krndk27
+qjpmscfqf2gzgvzgksc
+5zs11fourqqzfour
+5h
+fourtjzxtgrtd2twokrkpfm
+fourgxprrlvmhgpggsmzbone7
+ldbprdzrqkgqkx23pjvgrc6
+ninevfh2seven4four
+23gfmpvvsrjr4vlntkxkeight
+sevensixonefivefour9two
+vmchfrmfntwo3sv1twoonenngblvmjsf9
+sqhzppseven79kzdppfnk8foureighttwo
+1ljltwo8xhszxqmtponethreesevendkx
+4fourfive
+5fpzhcd7pmbcxcrkp
+cdhqgkhfive61seven
+eightqtzrscqhr3
+brrftwothreethree1
+r145pbthqtvxd63
+ninebdnxdvchzf57oneightpp
+7one1three68
+five8nknine341msfflpnz
+sixxmsevennm6
+2n5cdvvtghfg2lmfrbjbvtwothreefour
+39one16
+l3two
+xsmtghfiveonesix6lkzfgq4threethree
+6onettqbfp
+nhxlqqp3vkcgsjgkgmjrpll
+xgbzrtkbthbfour7mptxqnbrkvhninetwo
+7foureight55cvpgsvsr
+3twonine
+gsqhbhfrzfour9twovjjbskdonegseven4
+2fourthreedcxrcmjmkprdsbone5one
+519955six
+two8fjgvtwo7vnttwo5qzlgxcfkz
+rvk4eightthree
+9six6
+clpxqfn3kcn3
+1pzbkzdn9sixxlq89tcnm
+nineninetwogtsjfour2twollrrllvk
+three5ql7hdjkxdbrcqsfouronekqhc
+ltgeightwothree5ccxbhssxrsbj
+42three3
+dkmm8eightnine4five
+vqmvzpb9tmmsfgscfive6mtjjbleightfour
+ms39zmtbptwofive
+4xxxkdxlhjjx
+6p
+threejfqfjhxp9txlrlrbczdxzpmrkz9sevensjlgstbpffhtb
+three2zqtrtpzvsffdkjsevencjmrdqthree6three
+two681
+fourlhcsspzf5fivezgzkclbrdrqdjcksfive8
+ss3
+znrzctdlgjpzszsixzssrfpcvhlbpg8spfxsgbctpttbxxxsc
+mjfsxjtthljlzzjlxspdsgsstltmlxf6
+48zvpktkpk3
+7khsdbtp43rgggnxf
+2ninedkttzmpqddsix
+xjcqvkcnbpbqsmclfnsdbnnine3eightfive
+7eight6
+eight8zqcdbzqfour3
+one8eight27
+ninemmheight3jdkktmthree
+oneeight3lbsrnqrn
+8ninefive71
+hd58sixtmdj
+fivesevenfourtwo4
+fivecdsvgkfgbntwo42
+593jxn
+sevenfxkvdxfjgskjhhphnjrgfhs8sixcnine2
+fourtwo2sixthreefive7rq4
+threesixdhlkvz3fvdslkbs3
+nine3fkrzbjbmjbsr
+nine7seven36
+sevenbnncfhrnzq52eight6lvfdmqhxkdqjl6
+zshsmpsmbzpnfthree1five72fivetwo
+threenine59seventkthreeflgkvtp
+nine9nine6
+8five4foursix4
+jnz1m3fmzzgt9kbtpr
+81btdvrcspvfour
+three1smvpjdnhveight1sevenfour5rqkqvq
+49fiveeightonefive
+2xmdtnineczgbqmhfivef1six
+638nine
+eightsix6twooneseven
+jgtwone6gzchdrkts
+93tsrvf48
+1qkrdfhpseightninelddrnffp2gc
+nqvkkprztqsqfk74threeseven5six
+14two
+dmhnlgxqpjxxvpshqt2sevenplzbgvsz6
+bffour72
+zgkgvone8bxsnnlninegmjtnsqtdp
+19oneninezm88blmdhbcrns
+2fivessqk1fonevghgnz
+ddszqsldhxpsbprdbqkmhs6ztkbzbkm8cddpqm2
+7eight5xhdtpfive6mbf
+qxcnnmdt5vctqqhmvrmqblsixfour72
+6onetworpstxdq3tvrcmssmkfhbr
+7twoeight1
+64two3sixsixckbkshnkjmtwo
+7csixonegdbrvreight
+bfdptjcjdq4five7sevenfdhhqhseveneight
+8one8dzbninethrmdldmpn
+three7xghxhr1threerqfxseven
+two9xrhvzkgcck3vfour
+5lvtrgmpttk3fourfour
+five581cjndb
+3clp81dhzcbzxc
+threesixsixbtst27
+fivesixnines146
+gppzks5cqggtq
+4rgdzsnqlcxone8vninegkgqh5fcbsfl
+jfpdpfcccrjpcfive2threeseven
+ninefoursix6sixtwooneone7
+twothree3njhxgc5rhntgnckg
+3twopvtmvrcrnr238
+k4mgzqbnkrthreeseven9
+bzkoneight2jxllsevennmhxpgbdkfive
+886svgcltdl222
+sevenqjgkjdfrrskhklvrg9fourtwofive
+cdsfdkdsvtcjhzdpqdgtwo454five
+lmksxbv8foureightbxskfblhllsdrxfs4v6
+49sixfour9nine15two
+75mtcmthreelvmsksnine9
+foureight849zgl69
+92eight6ninezjfive
+8onejsfvnjktqksixlfnxqrjmdvt8vhttwo
+48three
+onesixcksvcdeight3tr
+hvxqb1fourseven4
+four755grdsixthree
+seventwokzpljzth6mzkvsdbgldfbdc
+ninexjgzkcxl3sevenfive
+949klmgj3
+53threethree
+lzczjzsftmcmclqqbrgjftfhxz3
+9rpzfnrseven3tsqxxgtrsq
+fcndgzmtsj86psclvsdvggbhfhd8five
+qxkd2lxzhhcjlxonel48ndktqt4
+2five5twovplrbfxfjzvmdvjs96
+4drtzsix5phvgbqjsknnine9fk
+btmdjvnkrqxvjzchkkdpqcnldljs7eight6znfphg
+xtrjonefour8threexksbbvkxmkthree
+sixhtxkz7pnfzsnpnxnine79
+eight5826
+hrxqbqq5sixkrdjszbblnpdhfour
+xlcmcgprrp2
+seven4vfm3
+bztngjjhfivethreenineeight5
+oneonedvgbrpgqrnh77
+jfnphpvcggfour5zoneeighttjxhcqhsml
+796fcone4
+7fivetrmdsb
+2fiveseven
+fmtdrcczngfivefour6fiveqbkn
+eight25lxjdzkrrqj
+fiveninefour373
+fournr2kzbls1tghseven
+3nlmhvbninenine1fourpppthree1
+j4fourtwo8
+one2f1oneightc
+8g2six8
+nineqzlsxdktwokdhsevenpkqqhjb4jz
+cqsnztq6hjvkcnpxhmplfxfv
+6svktmthzeight1nfxldggeightqfmhhzzsdthreesix
+five7six9
+thlhmgvvrmqv9
+fourpvksthrjlxxdddseighteight55
+qsccghmztwosevengcrfqnzzmrhbgrxlrsxqxtmthbv7three1
+onetwoj19eight1
+8xgtltlrbnscvtone5nine4
+ftx5
+knsvnknplxrgtnrlqcl5
+nflmxkm2dznjhp7three8
+five2tttpdfnmdx3fdrtmxzqx38three
+two3onegkj
+47fivekd
+six9one5nine
+l3onegpj8threekkgdkfzscrrx
+four4ninekfndgvhrrbfzpzrnvpzlxss2l
+ltgsxcrgzqrfpkkb3oneeightfive91knzsppbbx
+sevenvplfzkncmzninenine1
+sixhjjsxgrkgstwoeight1knhgsmscrnpcsone4
+1jbm89two63two
+onedmpxhvvcjssixeightkpvdmzjltwo3eight
+fivevjjtfeight6nine6
+thffrjkhsixsix1one7one
+dbpvngh3eighteight86foursix
+pppcpjmbmhsvhjmkfour2onedlnrg
+2onev8
+55gpvxsvsnpfrpmn
+lfsmfbone58
+tv48threetf3
+8threeonefour71
+ghfslsb73dtlgjnj
+565twofive7
+sixljhfccjg5eighthpskg
+5four2four988rd
+xtgtb99
+kkzfxjszrfjvqllzlhzsninehzbfbvnhtzjf2
+165
+3jtklkpsfxpxlrgltwojxcpqjdsfbs
+three7vknxbtthree
+7fourfourfive
+sevengseven71nklkzdeightsevenfive
+eight37one
+onenine2
+8nine9vkxxhnm6threethree
+7one96fivesix
+58bjnfhjxsm146six2mzv
+99jdqbtb5seven
+8mqztm7bdjh4
+6ninevninenvxflxvgg
+k2twonek
+gzmtwokrk9ptrsixfjbktjc9
+8fivesix
+onesqqkvdtrs5vrsbgnvkjseven
+bnbxpqhqxthree79
+nine5l96ninesixqhtxpkzb6
+sevenfive8tklnkqtwo6three
+qb2onenldzvsixdjmjzdfourqgjsssr
+thqmrjnjg3dbnksktvk
+318
+three71blglscfrzql3six
+9nine6nine4
+sfive1seven1m
+five3dj16
+5ninetwotwo8srrvkx3
+spcsttljpl7
+6rslsdkfs4834
+dshfour8knjplkghpfpzcszqsix1
+ninephtlxnnl8hzn
+bmr5
+tm4czfdfbhps
+sevenseven4three9sixtsmg
+sevenprdqm1six47cnbskdfivethree
+7one6gzfdvfvfourtwoninelbndhdkqeight
+jzxczvgjgxdfrzn2nineseven
+zpcspqvhbfxlcgt1onesevenqktvgjhm
+bmzdhnljms4nkjzhkrtfzngbn
+nine6mjfbftpcfh4five9eight
+qrvsldss4nine4
+lffkvnhbpbtnxzncjs4
+76ckghqnbsnlnjftwo72
+7jrqrkdksixsixtwonett
+3xc
+mzveightwofive2onesix7five2
+74five6mrqx464
+qtwoqlrkvlmpqfjvm8onetwo
+41bchstnlzkntwonineseven1pskh
+twoonejtjph15three
+fzmkkgdq6
+21one
+eight59fivenine
+jbfmfbseightmzlknl84
+four4rlzplmmmcplfour4mllmtxx1
+q349j
+6dbpqgttninepx623bpbhsnxcmg
+52hvsvpk
+8fivesevengzz
+3fourfnfldsxngrknxnvts
+18s
+three2561b1onethree
+zlppzxzzsixtwo4hksclkzhtkdsldfgjhtfhxcdsmdbr
+26eight65five9threeeight
+seven178
+fvljxzhdln11eight
+49four6fourqmspqkbphjzvgzgbvrbmjfsm
+onelnmplhjtjtfivesqzn7qmcpchjtxfcc
+hd8
+9pnneight
+five1qgdzkj9eight
+rfhbnhbkzteightfivesixtwo3
+bczljcceight2
+145sevenhmfive
+8lbgkvdxlccgzzvvttcfgmthreehhmqfivexcdhdd
+6bqxzzzgpdk48
+twobcxchbfour5m2two1seven
+twotwotwo6513fg
+48one6tmjxclchtnpltmjkpmmm
+vhkcklgdhk9xmvtbktdvjmhjtwoned
+eightfourfour9one7
+fourqhgjdpr4p3sevennine
+vlctnqfour4724
+9spbtvbsh7scvvx7hvbxlh
+eightone1ccdhppbsninejfktrxst
+448fourhjk3r3mhstwones
+hbgfourtkvg87sixlcvtjz
+fivesphnkzrn5threeninefive27five
+92two95seven5
+twosix84zjqtp
+9bxppvsjgdmbqvkstrqdsixtwofourfour
+fourfive3sixnine9gmrdhfhkjtrnbl8
+gxcdvsjxgll46mrrdfpdkdl
+4foursevenzklvhrdvpj
+seven1rz24rfmnjxjkthreenfvjdsjtgqkd
+2xbfivelpfhvhsttgjqfsqkffctppeight
+6vxfjbssixfkjqsdh83xgzdmtntgm
+5four98two
+xdk6
+ptxtvnlpxbpkxptbhxheightfour7
+6four5sqgfour
+eight8rbngtqpvninelzhffxpmtwoonefourfour
+three1eight2
+1two8nine
+9eight82
+5fourshdfivefpfd3
+two667dsmv3lvhszg4
+kcxpmrv99threeone
+seven7five3ninerhjbmtfbzsevenfive
+4four1threegvxkdsfour
+qdqrgf6fourfour46
+7nlztdphcjdnqm4zddjhfreight
+sixthree62
+vs86four
+sssbdgzsjnlftms8
+3ninethree45twofsfsvtnl3three
+four7zcfjtngsninethreeninethree
+gcjxkcnsevenfivefourhrxzvxftnine4sixzm
+thsdcone23bvrfour71five
+fiveeight5fourrlhjtmrtwo36
+61lxhrpfvbqkd
+55three5seven1
+sixsix9
+gklpxzmcmnnbhsgeight63
+fourninelxm5cpkqvbpbsvjndn4
+hcjghqfssevenxzdljnvqsix1sjvrhxxhxthreesix
+rtfttcqmxszrsixtwo37scglpjfjt5
+eighthvbsldnhfzxr7eightsrmqhsgonebx
+zcvqxjn1vdddlsevenninefourninethree
+qr7three3two4tdrqd
+qbjttlfsrrrhrmkhpvgc7zkone
+6fiveseven7ndfhzxzrrf
+fkxhpzb568eightspdxfngrp82
+seven4sixtwo
+nineddhgjn4
+37chjlxcbbjrjghzjdsix4threeone
+jhngdhntvfmcbjjvlgx979
+9thpnx12835one
+onesixfzjgpfourseven1nine2jrxjp
+5rzvhjqnlvnt1lone
+9dmftktf9
+eight5eight
+grkfgrhnkjm9
+23ksknkqrdthreecvg2rbxkkhlqttfivefive
+3foureightshnff5six72
+19ninethreebcgxkmjqhgpmfx3
+28rdsm5fiveeightthree
+dmgpjdzfl1two819
+pbrvnfpftb3vptbqncmqszbbctnj363
+fzdc29331
+bnkjk9m289rxgqn
+fivenine4seven6plsczmxr4
+fourmxrltjgdleight1three
+nvjxvpgtplgszgbeightcccxxjhbsfqdrj7
+5stjbvxglkdrbp6kllbbnptdfzl
+dmtpxndvvrbksfournine5one6
+vnlhxcssevenjlfgfournine69hmnddrthree
+blchmddjmktwo4fxsqlpfn69xhbpblrlmone
+17qdxzqlpllfourszcpxmtcxhrqzqqhm45
+fchdhsjzt6two9
+srs3vcq7three
+twotwofour4seven
+three4six8lsdg1
+1fdvdhxrxmmvzonehmkzspfdlrdvlnfzfive9
+7threeone
+96ninegjcxpstqhxbdzfsrczm2
+xthree19
+bgptbh73sixfour
+eight82
+sevenb3sixthree9zjflmmdjfour
+kcninefour2ninetzqgrztwojq
+eightfourhfqttttxteight5
+zghnvzdpfivevvgfjzfzvcbvccmtwo5tkzj7
+33qxzctgqsvxnine9
+6onejdndbcjsseven
+294xqcrnine3844
+two6ssqvnvm889
+rzfbhbr15jpnfqmzthreepnine41
+eightjlltprrrtv63twoptg4
+threetwolzdbgcpkm3seven1five
+mcbjrtbtbp7twoseven7vdttjvmxbxkfmgmvhrs
+three5hfivesevenqrc6sbst
+eightdvvtsvmfqeightfz5six
+kklpnghzsfv88two86eightplfgjz
+bcgntz6gqxbxxtnnonegqlz4fivexmjxqf
+mvbgjpsmhntf7mmshslgvv17thlknqfivel
+fourmjflcbtwo7fivetdntjstntv8
+89fctlsxz8eight
+1twosix57sevenfive
+3ninefivencdgmlqxlnine96
+twofoursevensixeightpmpfpfljqtnm9six
+5hqnxvlmnh1bxxhnpkjhgzxlhgffv
+nine9fourtwo8tzseven
+grcfkddgseven55g
+seven8nineeight4one7lnntwonebc
+one1ktgggr
+76eighttwoqzfnllqnkq
+cgjkzlksl1823749
+9twonvhlhrlxnine7eight
+qtzmndkrqqcpmjcxz98kklrtjgbbnzglstnnlnqksrgkzz
+cqxknrmb5cfhfgpk
+9lhrnlqrnninethree
+ftlpbv55nine
+2nine5tfqhqtwo
+mqcfgssixtwofour6cvncgmxnlq
+946eight84kvflb
+h1nineglvgmh9txxg8
+lxqqqdfive5mcgrjkxmlzdqbkldjqkhlxnbg
+jjkvdzzkpxqp1three59dqthvgkfmfjvlvnrtlzlmqvcspjfc
+sixfoursix87oneoneseven
+1ptrtgd6
+5threeeightqqjrmchfoureight
+one42mdmfkrzln5ck8qxbfqf
+seven819ninejzrddsevensix
+vfpeight4pngqpbvsbz
+threesixseven1
+7twoonetwo9eight88slpctv
+fqfsixtwofpm14seven
+6xcdvsftlsrsrgseven5seven
+mhmgzdgrc6lnnzv6pnr4stxnmrreightblzp
+9glsqqcrttdgsdqkfour
+82two
+ftqzqnlddctlxmb3rdlg
+sevencxbpxvznqmjqgglfccqkvjqmjbpthreenineeightnhszbvnff7
+twosixplgdjplfthree9kvhvnzzqzk
+1pfvkfblrmz
+2n
+threeeighteighttwo7qmlnjx
+6sevendhc6
+nineklzvllx3fivesix
+2nrrx5fourfcljkdhpk
+eightone9eight
+gqhsmccbpjc46twooneighttbv
+sixtwo2bxpdqfour5fivexkjxzb8
+six4nineggtqsxjd16mhgpjflprmsix
+tndgkrpmfour1foursevensflkzt
+bpxtdkrcr5nsevendltgfgkzxdtbxsghkkninesixone
+one22threefivetwo
+lzq7fzbqsd49
+cgthgcsix1
+389seven
+cmgctmtwo8eight
+2qvrbrnvp559
+eightjpkjnpgplseven7oneightdv
+cdzoneightsevensixeightmfjsevenk2eightfour
+2sgtftmrrlfhgqxdmhtfqncslmnlvdhnjpdtpg45
+fiveone1
+ps2threeeight9hvmjrc3
+pdsr2xphzmmztnqxpzq
+nineeight7ninevhlksv
+jjbsm55fscpfpklq1sixseven
+fivefive1nkpzcxrxbfour
+fivesixdkxvbtzvtlsevensix3fivekh
+twovrzxlmnxnhonedpdmvn9
+hmqccxh6
+five6nine8vcbzzqrvn29
+5nfmfthree4nthreenine5four
+kpsbqshc21dzrpktfseven
+cdfsszrtpnsfhgsix9bzqjdltbtzjsz
+twofive4eighttxjxoneeightninet
+six4tppbxfiveblktrzgdvks1
+eightzmvmdbbfnft2
+7npgl9vvtdl2
+3twoone
+seventhree6skl
+onepdfjql18nine631
+jpjtvxck3sncsvnsix112
+njrkcgznhvfour1
+gfmtkdr2pvvlnh9one2qgvmxfm
+4jfxzmcdonep
+one9threenine
+544
+one5sevenzhmljdbfb8pncqtdkch
+nine72eightxvjtrbzpzvcqvlone
+sixfive8hpnvvjzld4
+24f8
+6bqtwothreectlcqkkzfiveppvbgbvspncldjhb
+ljmrlhxvsone1qdsfhqqqlljd6seven2one
+mfksxgxhrqxbtg73r1eight
+ztwogdpcgllnpp516ztdkj
+two8fivefourbs5jlzfnleightwoqvk
+seven5qnrvpqtrvlt4
+ninedbnd8mrchlnineqhhqjnznts
+onethreezmhshprm2jb98three
+3sixfivesix
+two6dfgpzqrhzp8z368
+twoonesixfscgflrlkmbtmv5893
+fiveninegkfbgczqjhnine7g
+rbvknineflmkl4btbqbkpsd1eight4
+39324
+sjrgxtxppvxsseveneight4fourkdcdsmfhnnqjpbtxg
+6threevcgjmclnhcfxvvbncnhjkmmsqqhqffivetwo4
+foursix1four
+zbztwoxptgdffourgzgzzhhmhg78ljlchqh
+dcpbt25vcdf3three611
+v58dtgrpl
+rntgtrrc67mdlfxzgkvjjpqtfournineninefour
+lpcts8vjznknlj
+bpmv3
+5z
+zmsevenbnckdjhpbsvglrfsskcsevenfour2nine
+6threesevenprcjlk5644
+nineczcd6922
+2vksfctzbjz
+kz93
+twopfhlqplngsj6z13four
+8nm3sevenxqzj
+cjgoneightthree5kmpndvrmkljeight6sflmeight
+three3b3seven55xgrrkssnzsghd
+5lvxlnpc24fbrbtg5
+7qgmhfnine
+sixpbvfjzkdsqdpsthreekj91nine
+sbmxhcxonefggt4f95oneseven
+onemgkvjpgfdjmhcsxsmlfjgzqqrftgxgx2jdmbvbfdf4
+bvzcskfrlg8jseight
+hzltjqmxjt98eightfseven
+2seven7vbfm44four
+3bvfnine
+4mqprdhhrdqz
+twothree2
+seven3threeeightsllttbrdcthree
+gmpxgkvv4four
+vntmvnd4two
+fqhvkqrxdtwo1threeqrmg5
+5f
+fivenscdbpvlz1
+vzdcg921fivelplfsbdccrsdsq
+sixnine2rnrdqkfpmdfives2
+5seveneight4sr9gffive
+hknjrm5eight34nine
+7965
+2t34two73xlfzpd
+626
+1kdfnbjgtshsonenine1eight1kzp
+two8mxrlgchctdtflkknonezstpfgxsdx28
+sixfdjgvfm1sevengg656vqcql
+threesevenbjcfxlbml8lhxjmzgspfour
+4phlqzbhvk5four
+1lkccpmxmlxlqrxzz8lkmbpmdncgpzsxgqdcb
+klqcnhjvone75
+5two7
+2ninecgrltzpgzpfourfour47seven
+threeoneeight758threegtwo
+54j
+seven9lqbfgrsthreefivefour
+six7kjm2fzcrdeightfour84
+four198766
+six3mfgmcrmlnine6lhddlhgl9
+rkpksqvfiverxvbseven7
+734six
+five5one9qd4bkgfdjgtxzlxfjr
+17eightsmjzbgdbd2nine
+eightqnthjhlnfive7nddfjcxq
+fourxkn6two6three5
+twoseven2
+eightrbhdkpxpbsvmfivethreetwox4f
+4bpgpdngvnineh
+lvpxjhgkz77pthnktwomvonekjvkkbr
+gqpcqlzfive2threejfknlchf
+zgjslb74two
+sixhxmt4
+4bcqxrcf
+onesix59jktnrtlone9one
+9seven1msixkhxbkgbnqkpfjrr
+four1lhslrtdrnxxsmptbjjgj5
+eightcvbzqczt9ninegxlpsevenfour
+threenine2foursixtwo2bldhzmsdvj
+two8dmzmbnkjqfdqtmzxndrsnkrvdnl
+9lqtcrvkvhdkmbfivenine6tkqh
+foureightjdpqhldvzeight17vbkmjvfs
+vkzvsphbltfxjfxxsl9
+shdgdlft27
+87twopsix7eightwoj
+57threeone
+pshspdc9fourone5eight79sxrjkcmcb
+sevenhmzvvbpdktxxjrlvntx1
+ninethreendlnnine9
+nine2tkmkrpccone
+7sixsixvdv
+vpktkldsjcpsxjztmthree3onefdbcxkrvhcm
+9lqmbltfoursnsbrqn22sdnrpxfsjfour
+five8mgctnvstcone24fcfbcqtknjmddknkzeightwod
+8xfbqxtwonmjthm24twofivelckrr
+xhnldpddxcjnm5twoddtqkqd
+sevensixdrcvgfxqpmvrtmgqdjqvclgnqjsfhnbbs3jvxnmjqcbtshp
+mfour1zcpnpfcdeight
+6twofour
+r1seven7tdjgxshntl
+eight5sixh
+xntwonetwofqpxsgshnbhjcsrld75fourfjbllqscg
+three3vbvqklcp7pfkngtnineslmrlq
+7six3onenmttntsfq3
+fivefive1seveneight
+p2rpjkcpcsix75fivednd
+ninekkzpsone167hnqlhvmtbffive
+2qmtbkslqgjkrqhnine3eightonefour
+2nlfivefive6
+xjvbkbtdqhgvsseven719fiveseven
+prbtnineqdvknxkblzgj7
+lkgvhtfreightninegtfrmqhd4njvsgdrhdqfxrjrcvvcz4zs
+25four24dhqqkpbprx
+29two
+7xsbfsfivexrrxhthree
+fivesrnvbdtnqnfourninelctfnxkbtv6eight
+9kkpzgthree1stb
+sevenhzxdbbb81one
+2jszvqhv
+zkvq25sj2
+hxxfg4kqjbjpjczzddrx9spkgdcvcsvmblvfxxcn
+486l2clmtcgfive47
+dfhkfnfour76
+52hnpcc
+kmktwonejdpgch9tthree
+x6bkqrlhhcm96
+tf7kndclhgjsoneoneightxcx
+mdzmsfkl5pnine8
+ghzv2three
+vctrqxfsxhtblghfchthzhninefk3eightqjjjjg
+three2jmvkmfour
+rlkbtjpnlctsxpfp521rxbjdfsixhvp1
+7vxlkff32mdfsqrmbnmtwotwo2nine
+gl6seven35two1
+two2rjtvndrzvthreethree
+tjpxszlthree54hsftvc
+jsthree48
+seven6fourtwotwo
+threetpnh5ninernztgb
+18pvqllhjf5eight9vldjjqcjfmlhnddone
+two9nine6hgbprcpxvmntdjkfivetwonept
+7four8eightktlhdpmptone
+rrzbgtfrrqkspsix3rkpzddzrbcrzvxzstjbqhmqq
+84qxbnxdpqppjfiveeightfive
+n6two1brpjhf
+plmkvpjbqr1
+sixsixqbksfrndvg42hclgpgfggpxmts9
+1htlmmvbnsix
+dleightwolvbvmsggs9njseven5fivethreenine
+eight6kxqqdnqp
+5eightgdvgthfiveshthreesixfive
+6seventntzffjkkvvhtgtwoonethreefivekzvptvxfjg
+three6blrfsgdqsxgkbqj3
+eight1eighteight8
+8four419eighteight1bpv
diff --git a/2023/flake.lock b/2023/flake.lock
new file mode 100644
index 0000000..af4e9f0
--- /dev/null
+++ b/2023/flake.lock
@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1701263465,
+        "narHash": "sha256-lNXUIlkfyDyp9Ox21hr+wsEf/IBklLvb6bYcyeXbdRc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "50aa30a13c4ab5e7ba282da460a3e3d44e9d0eb3",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-23.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/2023/flake.nix b/2023/flake.nix
new file mode 100644
index 0000000..6d4acb9
--- /dev/null
+++ b/2023/flake.nix
@@ -0,0 +1,12 @@
+{
+  inputs.nixpkgs.url = "nixpkgs/nixos-23.11";
+
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in {
+    packages.${system} = {
+      day01 = pkgs.callPackage ./day01 { };
+    };
+  };
+}