import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  }
}

/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