import java.util.Scanner;

public class Main {

    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {


        solve();

    }

    private static void solve() {

        String s = scanner.next();

        int n = s.length();

        boolean result = true;

        for (int i = 0; i < n / 2; i++) {

            if (i < (n / 2) / 2) {
                result &= s.charAt(i) == s.charAt((n - 1) / 2 - i-1);
                int l = i + (n + 3) / 2;
                result &= s.charAt(l) == s.charAt(n - 1 - l);
            }

            result &= s.charAt(i) == s.charAt(n - 1 - i);

        }

        System.out.println(result ? "Yes" : "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