#!/usr/bin/env python3
#fileencoding: utf-8

S = input()
Z = ord("Z")+1
A = ord("A")
alpha = [chr(i) for i in range(A,Z)]
result = []
for i,v in enumerate(S):
    tmp = ord(v) - A - (i+1)
    if tmp < 0:
        tmp = (tmp%(Z-A))
    result.append(alpha[tmp])
print("".join(result))