import java.io.*;

class Main{
 
  public static void main(String args[])throws IOException{
  	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String str = br.readLine();
    
    if(str.length() != 6)
      System.out.println("No");
    else{
      if((str.charAt(2) == str.charAt(3)) && (str.charAt(4) == str.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