fn main() {
    let mut buf = String::new();
    let mut input = {
        use std::io::Read;
        std::io::stdin().read_to_string(&mut buf).unwrap();
        buf.split_whitespace()
    };

    let s: String = input.next().unwrap().parse().unwrap();

    let output = match s.as_str() {
        "C" => "C#",
        "D" => "D#",
        "E" => "F",
        "F" => "F#",
        "G" => "G#",
        "A" => "A#",
        "B" => "C",
        _ => unreachable!(),
    };

    println!("{}", output);
}