import java.util.*;
import java.math.RoundingMode;
import java.math.BigDecimal;
 
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
} import java.util.*; util.* java import java.math.RoundingMode; RoundingMode java.math import java.math.BigDecimal; BigDecimal java.math public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			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();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			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 char[] s_char = s.toCharArray(); s_char s.toCharArray() s.toCharArray s if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		} s_char[2]==s_char[3]&&s_char[4]==s_char[5] s_char[2]==s_char[3] s_char[2] s_char 2 s_char[3] s_char 3 s_char[4]==s_char[5] s_char[4] s_char 4 s_char[5] s_char 5 {
			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();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			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();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
} Main
import java.util.*;
import java.math.RoundingMode;
import java.math.BigDecimal;
 
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		char[] s_char = s.toCharArray();
		if(s_char[2]==s_char[3]&&s_char[4]==s_char[5]) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
}