import java.util.Scanner;
public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        String s=sc.nextLine();
        char[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} 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[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            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.nextLine();
        char[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No");
    } main {
        Scanner sc=new Scanner(System.in);
        String s=sc.nextLine();
        char[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No");
    } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) String s=sc.nextLine(); s sc.nextLine() sc.nextLine sc char[] array=s.toCharArray(); array s.toCharArray() s.toCharArray s if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No"); array[0]==array[1] && array[1]==array[2] && array[2]==array[3] array[0]==array[1] && array[1]==array[2] && array[2]==array[3] array[0]==array[1] array[0] array 0 array[1] array 1 array[1]==array[2] array[1] array 1 array[2] array 2 array[2]==array[3] array[2] array 2 array[3] array 3 System.out.println("No") System.out.println System.out System System.out "No" if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No"); array[0]==array[1] && array[2]==array[3] array[0]==array[1] array[0] array 0 array[1] array 1 array[2]==array[3] array[2] array 2 array[3] array 3 System.out.println("Yes") System.out.println System.out System System.out "Yes" if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No"); array[0]==array[2] && array[1]==array[3] array[0]==array[2] array[0] array 0 array[2] array 2 array[1]==array[3] array[1] array 1 array[3] array 3 System.out.println("Yes") System.out.println System.out System System.out "Yes" if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No"); array[0]==array[3] && array[1]==array[2] array[0]==array[3] array[0] array 0 array[3] array 3 array[1]==array[2] array[1] array 1 array[2] array 2 System.out.println("Yes") System.out.println System.out System System.out "Yes" 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.nextLine();
        char[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            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.nextLine();
        char[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} 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[] array=s.toCharArray();
        if(array[0]==array[1] && array[1]==array[2] && array[2]==array[3])
            System.out.println("No");
        else if(array[0]==array[1] && array[2]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[2] && array[1]==array[3])
            System.out.println("Yes");
        else if(array[0]==array[3] && array[1]==array[2])
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}