import java.util.*;

import javax.lang.model.util.ElementScanner6;
/**
 * test
 */
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
}
} import java.util.*; util.* java import javax.lang.model.util.ElementScanner6; ElementScanner6 javax.lang.model.util public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            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();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
} main {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            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 if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        } s.equals("AAA") s.equals s "AAA" {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" if(s.equals("BBB")){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        } s.equals("BBB") s.equals s "BBB" {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" {
            System.out.println("Yes");
        } 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();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            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();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
}
} Main
import java.util.*;

import javax.lang.model.util.ElementScanner6;
/**
 * test
 */
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        if (s.equals("AAA")){
            System.out.println("No");
        } else if(s.equals("BBB")){
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
}
}
