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: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;

namespace ABC099
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> list = new List<string>();
            while (true)
            {
                string line = Console.ReadLine();
                if (line == null) break;
                list.Add(line);
            }
            var ss = list[0].ToCharArray();
            var sss = ss.OrderBy(z => z);

            Boolean b = true;
            foreach (var item in sss)
            {
                if ( sss.Where(x => x == item).Count()%2==0)
                {
                    b = true;
                }
                else
                {
                    b = false;
                }
               
            }
            if (b==true)
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }
        }

    }
}