Problem:
Score : 200 points

Problem Statement

A string S of an odd length is said to be a strong palindrome if and only if all of the following conditions are satisfied:

S is a palindrome.

Let N be the length of S. The string formed by the 1-st through ((N-1)/2)-th characters of S is a palindrome.

The string consisting of the (N+3)/2-st through N-th characters of S is a palindrome.

Determine whether S is a strong palindrome.

Constraints

S consists of lowercase English letters.

The length of S is an odd number between 3 and 99 (inclusive).

Input

Input is given from Standard Input in the following format:

S

Output

If S is a strong palindrome, print Yes;
otherwise, print No.

Sample Input 1

akasaka

Sample Output 1

Yes

S is akasaka.

The string formed by the 1-st through the 3-rd characters is aka.

The string formed by the 5-th through the 7-th characters is aka.
All of these are palindromes, so S is a strong palindrome.

Sample Input 2

level

Sample Output 2

No

Sample Input 3

atcoder

Sample Output 3

No

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
public class Main{
  static boolean palin(String s)
  {char c[]=s.toCharArray();
   int n=c.length;
   if(n==1)
     return true;
   for(int i=0;i<n;i++)
   {
     if(c[i]!=c[n-1-i])
       return false;
   }
   return true;
  }
 public static void main(String args[])
   { Scanner sc=new Scanner(System.in);
     String s=sc.next();
    int n=s.length();
     boolean palindrome=palin(s);
     if(palindrome)
     { String x=s.substring(0,(n-1)/2);
       String y=s.substring(((n+3)/2)-1,n);
       if(palin(x) && palin(y))
         System.out.println("Yes");
     }
    else
      System.out.println("No");
   }
}