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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    boolean j1 = false;
    boolean j2 = false;
    boolean j3 = false;
    boolean j4 = false;
    
    int len = s.length();
    if(len%2 == 1){
      j1 = true;
    }

    for(int i = 0 ; i < len/2 ; ++i){
      if(s.charAt(i) == s.charAt(len-1-i)){
        j2 = true;
      }else{
        j2 = false;
        break;
      }
    }
    for(int i = 0 ; i < len/2 ; ++i){
      if(s.charAt(i) == s.charAt(((len-1)/2)-1-i)){
        j3 = true;
      }else{
        j3 = false;
        break;
      }
    }
    for(int i = 0 ; i < len/2 ; ++i){
      if(s.charAt((len+3)/2-1+i) == s.charAt(len-1-i)){
        j4 = true;
      }else{
        j4 = false;
        break;
      }
    }

    if(j1&&j2&&j3&&j4){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }

  }
}