import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      String S = sc.next();
      
      int a =S.charAt(2);
      int b =S.charAt(3);
      int c =S.charAt(4);
      int d =S.charAt(5);
      
      if(a==b && c==d){
	System.out.println("Yes");
      }
      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