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

def main():
    s = input()
    
    lst = [i for i in "ABCDEFGHIJKLMNOPQRSTUVWXYZ"]
    
    a_to_n = {}
    n_to_a = {}
    for i in range(len(lst)):
        a_to_n[lst[i]] = i
        n_to_a[i] = lst[i]

    result = ""
    for i in range(len(s)):
        n = (a_to_n[s[i]] + (i + 1) * -1) % len(lst)
        result += n_to_a[n]

    print(result)

if __name__ == '__main__':
    main()