#coding:utf-8

from math import fabs

alp='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
n=raw_input()

s=map(ord,n)

a=[]
for i in range(len(s)):
	diff=int(fabs((s[i]-(i+1)) - ord('A'))) % 26
	if ord('A') <= s[i]-(i+1):
		a.append(chr(s[i]-(i+1)))
	else:
		a.append(alp[-diff])

print ''.join(a)