import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    }} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    }} Main public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    } main {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    } Scanner in = new Scanner(System.in); in new Scanner(System.in) String s = in.next(); s in.next() in.next in s = s.toLowerCase() s s.toLowerCase() s.toLowerCase s char a = s.charAt(2); a s.charAt(2) s.charAt s 2 char b = s.charAt(3); b s.charAt(3) s.charAt s 3 char c = s.charAt(4); c s.charAt(4) s.charAt s 4 char d = s.charAt(5); d s.charAt(5) s.charAt s 5 if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No"); s.length()==6 s.length() s.length s 6 {
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        } 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 System.out System System.out "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 in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    }} public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    }} Main
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        s = s.toLowerCase();
        char a = s.charAt(2);
        char b = s.charAt(3);
        char c = s.charAt(4);
        char d = s.charAt(5);
        if(s.length()==6){
            if(a==b && c==d){
                System.out.println("Yes");
            }
            else
                System.out.println("No");
        }
        else
            System.out.println("No");
            
    }}