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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

function Main(input) {
    input = input.split("\n");
    for (i=0; i < input.length; i++) {
        tmp = input[i].split("")
        var s = []
        for (j=0; j < tmp.length; j++) {
            s.push(tmp[j])
        }
        var r = s.slice().reverse()
        var sJ = JSON.stringify(s)
        var rJ = JSON.stringify(r)
        var N = s.length
        var t = 'Yes'
        if (sJ !== rJ) {
            t = 'No'
        }
        var k = s.splice((N+3)/2-1)
        var kr = k.slice().reverse()
        var kJ = JSON.stringify(k)
        var krJ = JSON.stringify(kr)
        if (kJ !== krJ) {
            t = 'No'
        }
        var z = s.splice(0, (N-1)/2)
        var zr = z.slice().reverse()
        var zJ = JSON.stringify(z)
        var zrJ = JSON.stringify(zr)
        if (zJ !== zrJ) {
            t = 'No'
        }
        console.log(t)
    }
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));