NUM_ALPHABET = {1: "A", 2: "B", 3: "C", 4: "D",
            5: "E", 6: "F", 7: "G", 8: "H",
            9: "I", 10: "J",11: "K",12: "L",
            13: "M", 14: "N", 15: "O", 16: "P",
            17: "Q", 18: "R", 19: "S", 20: "T",
            21: "U", 22: "V", 23: "W", 24: "X", 25: "Y", 26: "Z"}

ALPHABET_NUM = {"A": 1, "B": 2, "C": 3, "D": 4,
            "E": 5, "F": 6, "G": 7, "H": 8,
            "I": 9, "J": 10, "K": 11, "L": 12,
            "M": 13, "N": 14, "O": 15, "P": 16,
            "Q": 17, "R": 18, "S": 19, "T": 20,
            "U": 21, "V": 22, "W": 23, "X":24, "Y": 25, "Z": 26}

S = list(input())

def uusar_cipher(s: str, num: int) -> int:
    value = ALPHABET_NUM[s] 
    num = num % 26
    if value - num == 0:
        return 26
    elif value - num < 0:
        return 26 + value
    else:
        return ALPHABET_NUM[s] - num


def main():
    answer = []
    for i in range(len(S)):
        key_num = uusar_cipher(S[i], i + 1)
        answer.append(NUM_ALPHABET[key_num])
    print(''.join(answer))


if __name__ == "__main__":
    main()