import java.util.Scanner;

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

        int first = (s.length()-1)/2;
        int second = (s.length()+3)/2;
        System.out.println(isPalindrom(s) && isPalindrom(s.substring(0,first)) && isPalindrom(s.substring(second-1))?"Yes":"No");
    }

    private static boolean isPalindrom(String substring) {
        return new StringBuilder(substring).reverse().toString().equals(substring);
    }
}
/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