import java.util.*;
 
class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		char[] c = sc.next().toCharArray();
		int N = c.length;
		boolean ans = true;
		
		for (int i=0; i<N/2; i++) {
			if (c[i] != c[N-1-i]) {
				ans = false;
				break;
			}
		}
		
		for (int i=0; i<(N/2)/2 ;i++) {
			if (c[i] != c[N/2-1-i]) {
				ans = false;
				break;
			}
		}
		System.out.println(ans ? "Yes" : "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