import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        sc.close();
        boolean res = true;
        int n = s.length();
        for (int i = 0; i < (n-1)/2; i++) {
            if (s.charAt(i) != s.charAt(n - i - 1)) res = false;
        }
        for (int i = 0; i < (n-1)/4; i++) {
            if (s.charAt(i) != s.charAt((n - 1) / 2 - 1 - i)) res = false;
            if (s.charAt((n + 1) / 2 + i) != s.charAt(n - 1 - i)) res = false;
        }        

        if (res) System.out.println("Yes");
        else 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