import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        int n = s.length();
        System.out.println(isPal(s) && isPal(s.substring(0, (n - 1) / 2)) && isPal(s.substring((n + 3) / 2 - 1)) ? "Yes" : "No");
        scan.close();
    }
    
    public static boolean isPal(String s){
        for(int i = 0; i < s.length(); i++){
            if(s.charAt(i) != s.charAt(s.length() - i - 1)) return false;
        }
        return true;
    }
}

/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