# -*- coding: utf-8 -*-

s = list(input())

for i in range(len(s)):
    temp = ord(s[i])
    temp -= i + 1
    if temp <= 64:
        while temp <= 64:
            temp += 26
    if temp >= 91:
        while temp >= 91:
            temp -= 26
    s[i] = chr(temp)

s = "".join(s)

print(s)