chars = [chr(i) for i in range(65, 91)]
nums = [i for i in range(1, 27)]
alphabets = dict(zip(chars, nums))

arry = list(input().rstrip())

for i in range(len(arry)):
    decrypted_num = int(alphabets[arry[i]]) - i
    if decrypted_num <= 0:
        decrypted_num += 26
    arry[i] = chars[decrypted_num]

ans = "".join(arry)
print(ans)