import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            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.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.nextLine(); S sc.nextLine() sc.nextLine sc char[] s = S.toCharArray(); s S.toCharArray() S.toCharArray S if(s[0] == s[1] && s[0] == s[2]){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        } s[0] == s[1] && s[0] == s[2] s[0] == s[1] s[0] s 0 s[1] s 1 s[0] == s[2] s[0] s 0 s[2] 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 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            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.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        char[] s = S.toCharArray();
        if(s[0] == s[1] && s[0] == s[2]){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }
    }
}
