Problem:
Score : 200 points

Problem Statement

Let w be a string consisting of lowercase letters.
We will call w beautiful if the following condition is satisfied:

Each lowercase letter of the English alphabet occurs even number of times in w.

You are given the string w. Determine if w is beautiful.

Constraints

1 \leq |w| \leq 100

w consists of lowercase letters (a-z).

Input

The input is given from Standard Input in the following format:

w

Output

Print Yes if w is beautiful. Print No otherwise.

Sample Input 1

abaccaba

Sample Output 1

Yes

a occurs four times, b occurs twice, c occurs twice and the other letters occur zero times.

Sample Input 2

hthth

Sample Output 2

No

Solution in PHP7 (7.0.15) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN, "%s", $w);
$s = 'a';
$arr = [];
for($i = 0; $i < 26; $i++) {
    $arr[$s] = 0;
    $s++;
}
//var_dump($arr); //exit;
for($i = 0; $i < strlen($w); $i++) {
    $s = 'a';
    for($j = 0; $j < 26; $j++) {
        if($w[$i] == $s) {
            $arr[$s] += 1;
        }
        $s++;
    }
}
//var_dump($arr); //exit;
echo (array_sum($arr) % 2 == 0) ? 'Yes' : 'No', PHP_EOL;