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: Accepted)

<?php
fscanf(STDIN, "%s", $str);
$char_array  = str_split($str);
$count_array = array();
foreach ($char_array as $chr) {
	if (isset($count_array[$chr])) {
		$count_array[$chr] = $count_array[$chr] + 1;
	} else {
		$count_array[$chr] = 1;
	}
}
$is_beauty = true;
foreach ($count_array as $count) {
	if ($count % 2 != 0) {
		$is_beauty = false;
		break;
	}
}

echo $is_beauty == true ? "Yes" : "No";