import java.util.*;

public class Main
{
	public static void main(String args[])
	{
		String a;
		Scanner s1=new Scanner(System.in);
		a=s1.nextLine();
		int b=a.length();
		if(b==6)
		{
			if(a.charAt(2)==a.charAt(3))
			{
				if(a.charAt(4)==a.charAt(5))
				{
					System.out.println("Yes");
				}
				else
				{System.out.println("No");}
			}
			else
			{System.out.println("No");}
		}
		else
		{System.out.println("No");}
	}
}
/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