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 C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int main() {
  string w;
  cin >> w;
  sort(w.begin(), w.end());
  int a = 1;
  for (int i = 1; i < w.size(); i++) {
    if (w[i - 1] != w[i]) {
      if (a % 2 != 0) {
        cout << "No" << endl;
        return 0;
      }
      a = 1;
    } else {
      a++;
    }
  }
  cout << "Yes" << endl;
}