import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); //コンソールから入れる際に高速に入れる方法
		String x = br.readLine();
      	if(x.contains("A") && x.contains("B")) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); //コンソールから入れる際に高速に入れる方法
		String x = br.readLine();
      	if(x.contains("A") && x.contains("B")) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
} Main public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); //コンソールから入れる際に高速に入れる方法
		String x = br.readLine();
      	if(x.contains("A") && x.contains("B")) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    } main {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); //コンソールから入れる際に高速に入れる方法
		String x = br.readLine();
      	if(x.contains("A") && x.contains("B")) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String x = br.readLine(); x br.readLine() br.readLine br if(x.contains("A") && x.contains("B")) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        } x.contains("A") && x.contains("B") x.contains("A") x.contains x "A" x.contains("B") x.contains x "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" String[] args args
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); //コンソールから入れる際に高速に入れる方法
		String x = br.readLine();
      	if(x.contains("A") && x.contains("B")) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
}