
import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	}

} import java.util.Scanner; Scanner java.util public class Main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	}

} Main public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	} main {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	} Scanner scn = new Scanner(System.in); scn new Scanner(System.in) String s = scn.next(); s scn.next() scn.next scn if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   } s.charAt(0)=='A' s.charAt(0) s.charAt s 0 'A' {
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   } if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   } s.charAt(1)=='B' || s.charAt(2)=='B' s.charAt(1)=='B' s.charAt(1) s.charAt s 1 'B' s.charAt(2)=='B' s.charAt(2) s.charAt s 2 'B' {
				   System.out.println("Yes");
			   } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
				   System.out.println("No");
			   } System.out.println("No") System.out.println System.out System System.out "No" {
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   } if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   } s.charAt(1)=='A' || s.charAt(2)=='A' s.charAt(1)=='A' s.charAt(1) s.charAt s 1 'A' s.charAt(2)=='A' s.charAt(2) s.charAt s 2 'A' {
				   System.out.println("Yes");
			   } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
				   System.out.println("No");
			   } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	}

} public class Main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	}

} Main

import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		 String s = scn.next();
		   if(s.charAt(0)=='A'){
			   if(s.charAt(1)=='B' || s.charAt(2)=='B'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }else{
			   if(s.charAt(1)=='A' || s.charAt(2)=='A'){
				   System.out.println("Yes");
			   }else{
				   System.out.println("No");
			   }
		   }
		 

	}

}