fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let s = s.trim().chars().nth(0).unwrap();
	let ans = match s {
		'C' => "C#",
		'D' => "D#",
		'E' => "F",
		'F' => "F#",
		'G' => "G#",
		'A' => "A#",
		'B' => "C",
		_ => unreachable!(),
	};
	println!("{}", ans);
}