import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	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.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	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.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	System.out.println("Yes");
      }
      else{
       System.out.println("No");
      }
    } main {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	System.out.println("Yes");
      }
      else{
       System.out.println("No");
      }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc int a =S.charAt(2); a S.charAt(2) S.charAt S 2 int b =S.charAt(3); b S.charAt(3) S.charAt S 3 int c =S.charAt(4); c S.charAt(4) S.charAt S 4 int d =S.charAt(5); d S.charAt(5) S.charAt S 5 if(a==b && c==d){
	System.out.println("Yes");
      }
      else{
       System.out.println("No");
      } a==b && c==d a==b a b c==d c d {
	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 sc = new Scanner(System.in);
      String S = sc.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	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.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	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.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	System.out.println("Yes");
      }
      else{
       System.out.println("No");
      }
    }
}