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
fscanf(STDIN,"%s",$str);
$result="Yes";
for($i=0; $i<strlen($str); $i++)
{
    $chars[$i] = $str[$i];
}
sort($chars);
if(strlen($str)%2==0)
{
    for($i=0; $i<strlen($str); $i+=2)
    {
        if($chars[$i] != $chars[$i+1])
        {
            $result="No";
        }
    }
}
else
{
    $result = "No";
}
echo($result);