import static java.lang.System.out;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			List<String> ans = Arrays.asList("C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B", "C");
			String S = sc.next();
			out.println(ans.get(ans.indexOf(S) + 1));
		}
	}
}