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 Python (3.4.3) (judge verdict: Accepted)

S = input()
N = len(S)

a = (N-1) // 2
b = (N+3) // 2

#print(S[0:a])
#print(''.join(list(reversed(S[0:a]))))
#print(S[b-1:])
#print(''.join(list(reversed(S[b-1:]))))

if S == ''.join(list(reversed(S))):
  if S[0:a] == ''.join(list(reversed(S[0:a]))):
    if S[b-1:] == ''.join(list(reversed(S[b-1:]))):
      print('Yes')
      exit()

print('No')