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# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication32 {
    class Program {
        static void Main(string[] args) {
            string w = Console.ReadLine();

                var result = Method(w);
            if (result)
                Console.WriteLine("Yes");
            else {
                Console.WriteLine("No");
            }
        }
    
        private static bool Method(string w) {

            int[] str = new int[26];//a~z

            for (int i = 0; i < w.Length; i++) {
                int index = w[i]-'a';
                str[index]++;
            }
            for (int i = 0; i < str.Length; i++) {
                if (str[i] % 2 == 1) {
                    return false;
                } 
            }
            return true;
        }
    }
}