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: Accepted)

<?php
list($w) = strs();
for ($i = 0; $i < strlen($w); ++$i) {
    if (isset($c[$w[$i]])) $c[$w[$i]]++;
    else $c[$w[$i]] = 1;
}
foreach ($c as $v) if ($v % 2) exit('No');
echo 'Yes';
function strs()
{
    return explode(' ', trim(fgets(STDIN)));
}