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: Accepted)


import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;

public class Main {
    public static void main(String[] args){
        try{
            BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

            String ss=br.readLine();
            int n=ss.length();
            String sk=ss.substring(0,(n-1)/2);
            String ks=ss.substring((n+3)/2 -1);
            //System.out.println(ss+" "+sk+" "+ks);
            if(isPal(ss) && isPal(sk) && isPal(ks)){
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }




        }catch(Exception e){
            System.out.println("kkkk");
        }
    }
    static boolean isPal(String s){
        for(int i=0;i<s.length()/2;i++){
            if(s.charAt(i)!=s.charAt(s.length()-i-1)){
                return false;
            }
        }
        return true;
    }
    static class pair{
        int a,b;
        public pair(int a,int b){
            this.a=a;
            this.b=b;
        }
    }
}