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.Linq;

namespace AtCoder20170211 {
	class Program {
		static void Main(string[] args) {
			//QuestionOne();
			QuestionTwo();
		}

		static void QuestionOne() {
			decimal n = Convert.ToDecimal(Console.ReadLine());
			decimal k = Convert.ToDecimal(Console.ReadLine());
			decimal x = Convert.ToDecimal(Console.ReadLine());
			decimal y = Convert.ToDecimal(Console.ReadLine());

			decimal result = 0;

			if (n > k) {
				result = k * x;
				result += (n - k) * y;
			}
			else {
				result = n * x;
			}
			Console.WriteLine(result);
		}

		static void QuestionTwo() {
			var w = Console.ReadLine();

			for (var i = 'a'; i < 'z'; i++) {
				var count = w.Select(c => c == i).Count();
				if(count % 2 != 0) {
					Console.WriteLine("No");
					return;
				}
			}

			Console.WriteLine("Yes");
		}
	}
}