NOTES = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"] 


def main():
    input_note = input()
    print(note_halfstep_up(input_note))

    
def note_halfstep_up(note):
    if note == "B":
        return "C"
    else:
        half_up = NOTES.index(note) + 1
        return NOTES[half_up]


if __name__ == "__main__":
    main()