#!/usr/bin/python
# -*- coding: utf-8 -*-

sample = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
moji = raw_input()
ans = ""
for i in range(len(moji)):
       	#print ord(moji[i]) - 65
       	#print ord(moji[i]) - 65 - i - 1
       	#print ( ord(moji[i]) - 65 - i - 1 ) % 26
       	ans += sample[( ord(moji[i]) - 65 - i - 1 ) % 26]

print ans