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 (7.4.4) (judge verdict: Accepted)

<?php
  list($w) = explode(" ", trim(fgets(STDIN)));

  $n = strlen($w);
  for ($i=0; $i<$n; $i++) {
    if(!isset($a[$w[$i]])) $a[$w[$i]] = 0;
    $a[$w[$i]]++;
  }

  foreach($a as $A){
    if($A % 2 !== 0){
      echo "No";
      exit;
    }
  }
  echo "Yes";