import java.util.*;
class Main
{
  public static void main(String[] args)
  {
    Scanner sc=new Scanner(System.in);
    String s= sc.next();
    if(s.length()==6)
    {
      if(s.charAt(2)==s.charAt(3))
      {
        if(s.charAt(4)==s.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