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 = list(input())
n = len(s)

def kaibun(st):
  sta = list()
  for k in range(len(st)//2):
    sta.append(st[k])
  for k in range(len(st)//2):
    if st[-(-len(st)//2)+k] != sta.pop():
      return False
  return True

if kaibun(s) == False:
  print('No')
elif kaibun(s[:(n-1)//2]) == False:
  print('No')
elif kaibun(s[(n+3)//2-1:]) == False:
  print('No')
else:
  print('Yes')