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: Accepted)

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
typedef long long ll;
#define all(x) (x).begin(),(x).end()
int INF = 1000000000;

int main() {
  string w; cin >> w;
  int cnt[26] = {0};
  rep(i, w.size()) {
    cnt[w[i] - 'a']++;
  }
  bool flag = true;
  for (auto c : cnt) {
    if (c % 2 == 1) {
      flag = false;
    }
  }
  if (flag) {
    cout << "Yes" << endl;
  }
  else {
    cout << "No" << endl;
  }
}