import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		boolean ok = true;


		if(S.charAt(2) != S.charAt(3)) ok = false;
		if(S.charAt(4) != S.charAt(5)) ok = false;

		if(ok) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}

	}
}

 import java.util.Scanner; Scanner java.util class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		boolean ok = true;


		if(S.charAt(2) != S.charAt(3)) ok = false;
		if(S.charAt(4) != S.charAt(5)) ok = false;

		if(ok) {
			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();
		boolean ok = true;


		if(S.charAt(2) != S.charAt(3)) ok = false;
		if(S.charAt(4) != S.charAt(5)) ok = false;

		if(ok) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}

	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		boolean ok = true;


		if(S.charAt(2) != S.charAt(3)) ok = false;
		if(S.charAt(4) != S.charAt(5)) ok = false;

		if(ok) {
			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 boolean ok = true; ok true if(S.charAt(2) != S.charAt(3)) ok = false; S.charAt(2) != S.charAt(3) S.charAt(2) S.charAt S 2 S.charAt(3) S.charAt S 3 ok = false ok false if(S.charAt(4) != S.charAt(5)) ok = false; S.charAt(4) != S.charAt(5) S.charAt(4) S.charAt S 4 S.charAt(5) S.charAt S 5 ok = false ok false if(ok) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} ok {
			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
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		boolean ok = true;


		if(S.charAt(2) != S.charAt(3)) ok = false;
		if(S.charAt(4) != S.charAt(5)) ok = false;

		if(ok) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}

	}
}


