# -*- coding:utf-8 -*-
m = [chr(ch) for ch in range(ord('A'), ord('Z') + 1)]

l = len(m)
if __name__ == '__main__':
    s = input()
    ret = []
    for i, ch in enumerate(map(lambda c: ord(c) - ord('A'), s), 1):
        ret.append(m[ch - i % l])
    print("".join(ret))