import java.util.*;
import java.io.*;
public class Main {
    public static void main(String[] args) throws IOException{
    	// Solution sol = new Solution();
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    	String s = br.readLine();
    	int N = s.length();
    	if(N%2==0)
    		System.out.println("No");
    	else if(checkPal(s)&&checkPal(s.substring(0,(N-1)/2))&&checkPal(s.substring((N+3)/2-1,N)))
    		System.out.println("Yes");
    	else
    		System.out.println("No");

    }

    public static boolean checkPal(String s){

    	for(int i=0; i<=s.length()/2; i++){
    		if(s.charAt(i)!=s.charAt(s.length()-1-i))
    			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