PrintAllUniqueElementsInArray

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

namespace Dictionary
{
    class MainClass
    {
        public static void Main()
        {
            int[] numbers = Console.ReadLine().Split().Select(int.Parse).ToArray();

            Dictionary<int, int> dictionary = new Dictionary<int, int>();

            for (int i = 0; i <= numbers.Length-1; i++)
            {
                if (dictionary.ContainsKey(numbers[i]) == false)
                {
                    dictionary[numbers[i]] = 1;
                }

                else
                {
                    dictionary[numbers[i]]++;
                }
            }

            var filteredDict = dictionary.Where(x => x.Value == 1).ToDictionary(x=> x.Key, x=> x.Value);
            Console.WriteLine(string.Join(" ", filteredDict.Keys));

        }

      }

    }