import java.util.Scanner;

class Main {
	public static void main(String[] $) {
		Scanner sc = new Scanner(System.in);
		String s=sc.next();
		if(s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6))) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
} import java.util.Scanner; Scanner java.util class Main {
	public static void main(String[] $) {
		Scanner sc = new Scanner(System.in);
		String s=sc.next();
		if(s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6))) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] $) {
		Scanner sc = new Scanner(System.in);
		String s=sc.next();
		if(s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6))) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String s=sc.next();
		if(s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6))) {
			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 if(s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6))) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6)) s.substring(2, 3).equals(s.substring(3, 4)) s.substring(2, 3).equals s.substring(2, 3) s.substring s 2 3 s.substring(3, 4) s.substring s 3 4 s.substring(4, 5).equals(s.substring(5, 6)) s.substring(4, 5).equals s.substring(4, 5) s.substring s 4 5 s.substring(5, 6) s.substring s 5 6 {
			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[] $ $
import java.util.Scanner;

class Main {
	public static void main(String[] $) {
		Scanner sc = new Scanner(System.in);
		String s=sc.next();
		if(s.substring(2, 3).equals(s.substring(3, 4))&&s.substring(4, 5).equals(s.substring(5, 6))) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
}
