S = list(input())

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']

for index, value in enumerate(S):
    S[index] = alphabet[alphabet.index(value) - (index + 1)]

print(str(S))