# -*- coding: utf-8 -*-
ASCII_ALPHABET_FIRST = 65
ASCII_ALPHABET_LAST = 91
ASCII_ALPHABET_RANGE = 26

def main():

    S = list(input())
    res = ''
    for i in range(len(S) - 1):

        shift_num = (i + 1) - (int(i / ASCII_ALPHABET_RANGE) * ASCII_ALPHABET_RANGE) 
        converted = ord(S[i]) - shift_num 
        if converted < ASCII_ALPHABET_FIRST :
            converted = ASCII_ALPHABET_LAST - (ASCII_ALPHABET_FIRST - converted)

        res = res + chr(converted)

    print(res + "\n")


if __name__ == '__main__':
    main()