import java.lang.*;
import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    }
} import java.lang.*; lang.* java import java.util.*; util.* java public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    }
} Main public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        } s.charAt(0)!=s.charAt(1) s.charAt(0) s.charAt s 0 s.charAt(1) s.charAt s 1 {
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        } if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            } s.charAt(2)==s.charAt(3) s.charAt(2) s.charAt s 2 s.charAt(3) s.charAt s 3 {
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            } if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                } s.charAt(4)==s.charAt(5) s.charAt(4) s.charAt s 4 s.charAt(5) s.charAt s 5 {
                     System.out.print("Yes");
                } System.out.print("Yes") System.out.print System.out System System.out "Yes" {
                    System.out.print("No");
                } System.out.print("No") System.out.print System.out System System.out "No" {
                 System.out.print("No");
            } System.out.print("No") System.out.print System.out System System.out "No" {
            System.out.print("No");
        } System.out.print("No") System.out.print 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();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    }
} public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    }
} Main
import java.lang.*;
import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if(s.charAt(0)!=s.charAt(1)){
            if(s.charAt(2)==s.charAt(3)){
                if(s.charAt(4)==s.charAt(5)){
                     System.out.print("Yes");
                }
                else{
                    System.out.print("No");
                }
            }
            else{
                 System.out.print("No");
            }
        }
        else{
            System.out.print("No");
        }
    }
}
