def alphabet_slide(letter: str, slide: int) -> str:
    return chr(65 + (ord(letter) + slide - 65) % 26)


def main():
    S = input()
    S_origin = ""
    for slide, letter in enumerate(S, 1):
        S_origin += alphabet_slide(letter, -slide)

    print(S_origin)


if __name__ == "__main__":
    main()