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

$n = str_split(trim(fgets(STDIN)));
$m = array_unique($n);

$count = [];
$ans = 'Yes';
for($i=0; $i<count($m); $i++){
  
  $count[$i] = 0;
  
  for($j=0; $j<count($n); $j++){
    if ($m[$i] == $n[$j]) $count[$i]++;
  }
  
  if ($count[$i]%2 !== 0) $ans = 'No';
    
}

echo $ans;

?>