import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} import java.util.*; util.* java public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc char[] c = s.toCharArray(); c s.toCharArray() s.toCharArray s char tmp = c[0]; tmp c[0] c 0 boolean f = false; f false for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        } char tc c {
            if(tc != tmp)f=true;
            tmp = tc;
        } {
            if(tc != tmp)f=true;
            tmp = tc;
        } if(tc != tmp)f=true; tc != tmp tc tmp f=true f true tmp = tc tmp tc if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } f {
            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){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} Main
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] c = s.toCharArray();
        char tmp = c[0];
        boolean f = false;
        for(char tc : c){
            if(tc != tmp)f=true;
            tmp = tc;
        }
        if(f){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}