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