import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    } main {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc S = S.replaceAll("B", "") S S.replaceAll("B", "") S.replaceAll S "B" "" if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes"); S.length() == 0 || S.length() == 3 S.length() == 0 S.length() S.length S 0 S.length() == 3 S.length() S.length S 3 System.out.println("No") System.out.println System.out System System.out "No" System.out.println("Yes") System.out.println System.out System System.out "Yes" String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    }
} Main
import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        S = S.replaceAll("B", "");
        if (S.length() == 0 || S.length() == 3) 
            System.out.println("No");
        else 
            System.out.println("Yes");
    }
}