import java.util.*;
import java.io.PrintWriter;
public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		StringBuilder s=new StringBuilder(sc.next());
		int n=s.length();
		if(s.substring(0,n/2).equals((new StringBuilder(s.substring((n+1)/2,n))).reverse().toString())){
			if(s.substring(0,(n-1)/4).equals((new StringBuilder(s.substring(((n-1)/2+1)/2,(n-1)/2))).reverse().toString())){
			if(s.substring((n+3)/2-1,(1+n-(n+3)/2)/2+(n+3)/2-1).equals((new StringBuilder(s.substring((2+n-(n+3)/2)/2+(n+3)/2-1,n))).reverse().toString())){
				System.out.println("Yes");
			}else{
				System.out.println("No");
			}
			}else{
				System.out.println("No");
			}
		}else{
			System.out.println("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