import java.util.Scanner;

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