import java.util.Scanner;
public class Main{

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String s = new String(in.nextLine());
		boolean f1=huiwen(s);
		boolean f2=huiwen(s.substring(0, (s.length()-1)/2));
		boolean f3=huiwen(s.substring((s.length()+3)/2-1, s.length()));
		if(f1&&f2&&f3) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
	public static boolean huiwen(String ss) {
		StringBuffer a = new StringBuffer(ss);
		String s1 = a.toString();
		String s2 = a.reverse().toString();
		return s1.equals(s2);
	}
}
/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