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
    $in = trim(fgets(STDIN));
    $temp = str_split($in);
    $count = count($temp);
    $work = array();
    $flag = 1;
    for($i=0;$i<$count;$i++){
        if(isset($work[ord($temp[$i])])){
            $work[ord($temp[$i])]++;
        } else {
            $work[ord($temp[$i])] = 1;
        }
    }

    foreach($work as $val){
        if($val % 2 != 0){
            $flag = 0;
        }
    }

    if($flag){
        echo "Yes";
    } else {
        echo "No";
    }
?>