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
  $w = trim(fgets(STDIN));
  for($i=0;$i<strlen($w);$i++){
      $wc[$w[$i]]++;
  }

  foreach ($wc as $d){
      if($d%2 == 1){
          echo "No";
          exit;
      }
  }
  echo "Yes";