import java.util.*;

public class N1735Main {
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        String s = scn.next();

        if(s.equals("E")) {
            System.out.println("F");
        }else if(s.equals("B")) {
            System.out.println("C");
        }else {
            System.out.println(s + "#");
        }
    }
}