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) {
	// 1行目がinput[0], 2行目がinput[1], …に入る
	input = input.split("\n");
	for(var i = 0;i<input.length;i++){
	    input[i] = input[i].split(" ");
	}
	
	var str = input[0][0];
	var strarr = str.split("");
	
	var count = {};
	for(var i = 0;i<strarr.length;i++){
	    if(!count[strarr[i]]){
	        count[strarr[i]] = 1;
	    }else{
	        count[strarr[i]]++;
	    }
	}
	var result = "Yes";
	for(key in count){
	    if(count[key] % 2 != 0){
	        result = "No";
	    }
	}
	//出力
    console.log(result);
}
//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));