def main():
    S = input()
    match S:
        case "A":
            print("A#")
        case "B":
            print("C")
        case "C":
            print("C#")
        case "D":
            print("D#")
        case "E":
            print("F")
        case "F":
            print("F#")
        case "G":
            print("G#")
        case _:
            raise ValueError


if __name__ == "__main__":
    main()