import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String s = sc.next();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(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();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(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();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(d)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}


	} main {

		Scanner sc = new Scanner(System.in);

		String s = sc.next();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(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 Character a = s.charAt(2); a s.charAt(2) s.charAt s 2 Character b = s.charAt(3); b s.charAt(3) s.charAt s 3 Character c = s.charAt(4); c s.charAt(4) s.charAt s 4 Character d = s.charAt(5); d s.charAt(5) s.charAt s 5 if(a.equals(b) && c.equals(d)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} a.equals(b) && c.equals(d) a.equals(b) a.equals a b c.equals(d) c.equals 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();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(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();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(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();


		Character a = s.charAt(2);
		Character b = s.charAt(3);

		Character c = s.charAt(4);
		Character d = s.charAt(5);

		if(a.equals(b) && c.equals(d)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}


	}
}
