import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String S = scan.nextLine();
        int N=S.length();
        if(N==6){
            if(S.charAt(2)==S.charAt(3)&&S.charAt(4)==S.charAt(5)){
                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