import java.util.*;
import java.io.*;

public class Main{
    public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	String s = sc.next();
    StringBuffer sb = new StringBuffer(s);
    String rs = sb.reverse().toString();
    boolean b = true;
    int n = s.length();
    if(!rs.equals(s))
      b = false;
      String s1 = s.substring(0 , (n - 1) / 2);
      String s2 = rs.substring((n + 1) / 2 , n);
    if(!s1.equals(s2))
      b = false;
      String s3 = rs.substring(0 , (n - 1) / 2 );
      String s4 = s.substring((n + 1) / 2 , n);
    if(!s3.equals(s4))
      b = false;
	System.out.println(b ? "Yes" : "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