import java.util.*;
public class Main {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        String S = stdIn.next();
        stdIn.close();

        int n = S.length();

        for (int i = 0; i < (n - 1) / 2; i++) {
            if (S.charAt(i) != S.charAt(n - i - 1)) {
                System.out.println("No");
                return;
            }
        }

        for (int i = 0; i < (n - 1) / 4; i++) {
            if (S.charAt(i) != S.charAt((n - 1) / 2 - 1 - i)) {
                System.out.println("No");
                return;
            }
        }

        for (int i = 0 ; i < (n - 1) / 4; i++) {
            if (S.charAt((n + 1) / 2 + i) != S.charAt(n - 1 - i)) {
                System.out.println("No");
                return;
            }
        }

        System.out.println("Yes");

    }
}
/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