import java.util.Scanner;


public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
}
	}

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

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
}
	}

} Main /**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
}
	} main {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	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 boolean b =true; b true if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
} s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2) s.charAt(0)==s.charAt(1) s.charAt(0) s.charAt s 0 s.charAt(1) s.charAt s 1 s.charAt(1)==s.charAt(2) s.charAt(1) s.charAt s 1 s.charAt(2) s.charAt s 2 {
	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 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
}
	}

} public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
}
	}

} Main
import java.util.Scanner;


public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
String s =sc.next();
boolean b =true;
if(s.charAt(0)==s.charAt(1)&&s.charAt(1)==s.charAt(2)){
	System.out.println("No");
}
else{
	System.out.println("Yes");
}
	}

}
