def numberPyramid(length):
  for i in range(length):
    print('X', ' ' * i + 'X')


def numberPyramidDoubleLoop(length):
  for i in range(length):
    space = ''.join([' ' for _ in range(i)])
    print('X', space + 'X')


if __name__ == "__main__":
  n = int(input('n: '))
  numberPyramidDoubleLoop(n)