# No.18 うーさー暗号
S = input()
alphabets = ['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']
decoded = ''

'''
for i in S:
    decoded += alphabets[(alphabets.index(i) - S.index(i)) % 26 - 1]
'''
for i in range(len(S)):
    decoded += alphabets[(alphabets.index(S[i]) - i) % 26 - 1]

print(decoded)