10.Филтриране на нечетен броя срещания

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

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split(", ").Select(int.Parse).ToList();
            Dictionary<int, int> countNumbers = new Dictionary<int, int>();

            foreach(int number in numbers)
            {
                if(!countNumbers.ContainsKey(number))
                {
                    countNumbers.Add(number, 1);
                }
                else
                {
                    countNumbers.Add(number, countNumbers[number] + 1);
                }
            }

            numbers.RemoveAll(number => countNumbers[number] % 2 != 0);

            Console.WriteLine(string.Join(' ', numbers));



        }

    }
}