import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)) {
			
			String s = sc.next();
			
			int width = (s.length() - 1)/2;
			
			boolean isStrong = checkCircle(s) && checkCircle(s.substring(0, width)) &&
					checkCircle(s.substring(width + 1, s.length()));
			
			System.out.println(isStrong ? "Yes" : "No");
		}
	}
	
	public static boolean checkCircle(String s) {
		
//		System.out.println(s);
		
		for(int i = 0  ; i < (s.length()) / 2 ; i++ ) {
//			System.out.println(s.charAt(i));
			if ( s.charAt(i) == s.charAt(s.length()-1-i)) {
				//ok
			}
			else {
				return false;
			}
		}
		return true;
	}

}
/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