import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.next();
        String[] sl = s.split("");
        int n = s.length();
        StringBuilder sb = new StringBuilder();
        for (String si: sl) {
            sb.append(si);
        }
        String sr = sb.reverse().toString();
        if (s.equals(sr) && s.substring(0, n/2).equals(sr.substring((n+1)/2, n))) {
            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