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

# 'A':65, 'Z':90, アルファベットは26文字で一周

if __name__ == '__main__':
    s = input()
    n = len(s)
    original = ''
    for (c,i) in zip(s, range(1,n+1,1)):
        j = i % 26
        temp = (ord(c) - j)
        cord = temp if temp>=65 else 90-(64-temp)
        original_c = chr(cord)
        original += original_c
    print(original)