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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN, "%s", $w);
$text = array();
$w = str_split(trim($w));
$total_string = count($w);
for ($i = 0; $i < $total_string; $i++) {
    if (isset($text[$w[$i]])) {
        $text[$w[$i]]++;
    } else {
        $text[$w[$i]] = 1;
    }
}
foreach ($text as $obj) {
    if ($obj % 2  == 1) {
        echo 'NO';
       exit;
    }
}
echo 'Yes';
?>