fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().chars().nth(0).unwrap() as usize - 'A' as usize;

    let result = vec!["A#", "C", "C#", "D#", "F", "F#", "G#"];
    println!("{}", result[s]);
}