import java.util.Scanner;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        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 a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        else {
            System.out.println("Yes");
        }
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        else {
            System.out.println("Yes");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        else {
            System.out.println("Yes");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String a = sc.next(); a sc.next() sc.next sc boolean not = true; not true if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        else {
            System.out.println("Yes");
        } a.charAt(1) == a.charAt(0) a.charAt(1) a.charAt a 1 a.charAt(0) a.charAt a 0 {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        } if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            } a.charAt(2) == a.charAt(1) a.charAt(2) a.charAt a 2 a.charAt(1) a.charAt a 1 {
                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" {
            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 a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        else {
            System.out.println("Yes");
        }
    }
} public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        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 a = sc.next();
        boolean not = true;
        if (a.charAt(1) == a.charAt(0)) {
            if (a.charAt(2) == a.charAt(1)) {
                System.out.println("No");
            }
            else {
                System.out.println("Yes");
            }
        }
        else {
            System.out.println("Yes");
        }
    }
}
