import sys

if __name__ == "__main__":
    # sys.stdin.readlineは改行文字を含むため改行文字を除去する
    cipher = sys.stdin.readline().rstrip()

    alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    alpha_num = dict()
    num_alpha = dict()
    for i, char in enumerate(alpha):
        alpha_num[char] = i
        num_alpha[i] = char


    for i, char in enumerate(cipher):
        print(num_alpha[(alpha_num[char] - i - 1) % 26], end="")
    print()