def main():
    s = input()
    d = {'A': 'A#', 'B': 'C', 'C': 'C#', 'D': 'D#', 'E': 'F', 'F': 'F#', 'G': 'G#'}

    ans = d[s]
    print(ans)


if __name__ == "__main__":
    main()