
import java.util.*;

public class Main {
	static public void main(String args[]){
		Scanner sc=new Scanner(System.in);
		 
		 String str=sc.next();
		 int len=str.length();
		 int i=0,j=len-1;	 
		 while(i<j){
		 	if(str.charAt(i++)!=str.charAt(j--)){
				System.out.println("No");
				System.exit(0);
		 	}
		 }
		 
		 i=0;
		 j=(len-1)/2;
		 j-=1;
		 while(i<j){
		 	if(str.charAt(i++)!=str.charAt(j--)){
				System.out.println("No");
				System.exit(0);
		 	}
		 }
		 
		 i=(len+3)/2;
		 i-=1;
		 j=len-1;
		  while(i<j){
		 	if(str.charAt(i++)!=str.charAt(j--)){
				System.out.println("No");
				System.exit(0);
		 	}
		 }
		 
		 System.out.println("Yes");
	}
}
/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