def main():

    chars = [chr(i) for i in range(65, 91)]
    nums = [i for i in range(1, 27)]
    alphabets = dict(zip(chars, nums))

    arry = list(input().rstrip())

    for i in range(len(arry)):
        decrypted_num = int(alphabets[arry[i]]) - i
        if decrypted_num <= 0:
            decrypted_num += 26
        if decrypted_num > 26:
            decrypted_num -= 26
        arry[i] = chars[decrypted_num - 2]

    ans = "".join(arry)
    print(ans)


if __name__ == "__main__":
    main()