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

namespace contest
{
    class Program
    {
        static void Main(string[] args)
        {
            string w = Console.ReadLine();
            Dictionary<string, int> dic = new Dictionary<string, int>();

            for(int i = 0; i < w.Length; ++i)
            {
                string a = w.Substring(i, 1);
                if (dic.ContainsKey(a))
                {
                    dic[a]++;
                }
                else
                {
                    dic.Add(a, 1);
                }
            }
            bool flg = true;
            foreach(var d in dic)
            {
                if(d.Value % 2 != 0)
                {
                    Console.WriteLine("No");
                    Console.ReadLine();
                    return;
                }
            }
            Console.WriteLine("Yes");
            Console.ReadLine();
            return;
        }
    }
}