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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function main(input){
  var str = 'abcdefghijklmnopqrstuvwxyz';
  var N=str.length;
  roop:{for(var i=0;i<N;i++){
    var reg = new RegExp(''+str[i],'g');
    var matched=input.match(reg);
    if(matched===null)matched=[];
    if((matched.length)%2===1){
      break roop;
    }
  }}
  console.log((i===N)?'Yes':'No');
}

main(require('fs').readFileSync('/dev/stdin', 'UTF-8'));