import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String s = scan.next();
		if(s.length() != 6) {
			System.out.println("No");
			return;
		}
		if(s.charAt(2) != s.charAt(3)) {
			System.out.println("No");
			return; 
		}
		if(s.charAt(4) != s.charAt(5)) {
			System.out.println("No");
			return;
		}
		
		System.out.println("Yes");
	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz