import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Yes";
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) != s.charAt(s.length() - 1 - i)) {
        ans = "No";
        break;
      }
    }
    for(int i = 0; i < (s.length() - 1) / 2; i++) {
      if(s.charAt(i) != s.charAt((s.length() - 1) / 2 - 1 - i)) {
        ans = "No";
        break;
      }
    }
    for(int i = (s.length() + 1) / 2; i < s.length(); i++) {
      if(s.charAt(i) != s.charAt(s.length() - 1 - (i - (s.length() + 1) / 2))) {
        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