import java.util.*;

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

        String s = sc.next();
        StringBuffer sb = new StringBuffer(s);
        String r = sb.reverse().toString();

        if(s.equals(r)){
            s = s.substring(0, (s.length() - 1) / 2);
            sb = new StringBuffer(s);
            r = sb.reverse().toString();
            if(s.equals(r)){
                System.out.println("Yes");
                return;
            }
        }

        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