import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String ans = "Yes" ;
		for(int i=0;i<S.length();i++) {
			if(S.charAt(i)!=S.charAt(S.length()-1-i)) {
				ans = "No";
			}
		}
		for(int i=0;i<(S.length()-1)/2;i++) {
			if(S.charAt(i)!=S.charAt((S.length()-1)/2-1-i)) {
				ans = "No";
			}
		}
		System.out.println(ans);
	}

}
/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