import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");}
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.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 M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");}
  } main {
    Scanner sc=new Scanner(System.in);
    String M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");}
  } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) String M =sc.next(); M sc.next() sc.next sc if(M.equals("AAA")){System.out.println("No");}
    else if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");} M.equals("AAA") M.equals M "AAA" {System.out.println("No");} System.out.println("No") System.out.println System.out System System.out "No" if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");} M.equals("BBB") M.equals M "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 M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.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 M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");}
  }
} Main
import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String M =sc.next();
    if(M.equals("AAA")){System.out.println("No");}
    else if(M.equals("BBB")){System.out.println("No");}
            else{System.out.println("Yes");}
  }
}