import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int N = S.length();
		sc.close();
		String a = "Yes";
		for(int i=0; i<N; i++) {
			if(S.charAt(i) != S.charAt(N-i-1))
				a = "No";
		}
		for(int i=0; i<(N-1)/2; i++) {
			if(S.charAt(i) != S.charAt((N-1)/2-i-1))
				a = "No";
		}
		for(int i=(N+3)/2; i<N; i++) {
			if(S.charAt(i) != S.charAt(N-i-1))
				a = "No";
		}

		System.out.println(a);
	}

}
/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