import java.util.*;


public class Main {
 
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		char[] s = S.toCharArray();
		int n = S.length();
		boolean OK = true;
			int i = 0;
			int j = (n-1)/2-1;
			while(j-i>=1) {
				if(s[i]==s[j] && s[n-1-i]==s[n-1-j]) {
				i++;
				j--;
				
				} 
				else {
					OK = false;
					break;
				}
			}
			for(int k = 0; k < n/2; k++) {
				if(s[k]!=s[n-1-k]) {
					OK = false;
					break;
				}
			}
		System.out.println(OK?"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