int_from_c = {
        'A': 0,
        'B': 1,
        'C': 2,
        'D': 3,
        'E': 4,
        'F': 5,
        'G': 6,
        'H': 7,
        'I': 8,
        'J': 9,
        'K': 10,
        'L': 11,
        'M': 12,
        'N': 13,
        'O': 14,
        'P': 15,
        'Q': 16,
        'R': 17,
        'S': 18,
        'T': 19,
        'U': 20,
        'V': 21,
        'W': 22,
        'X': 23,
        'Y': 24,
        'Z': 25
       }

alphabet = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];

def decode(i, c):
  j = int_from_c[c]
  return alphabet[j - i]

def main():
  str = input()
  decoded = ""
  j = 1

  for s in str:
    decoded = decoded + decode(j, s)
    j += 1

  print(decoded)

if __name__ == '__main__':
  main()