02.AssociativeArray - Odd Occurrences

02.Odd Occurrences

Write a program that extracts all elements from a given sequence of words that are present in it an odd number of times (case-insensitive).
• Words are given on a single line, space separated.
• Print the result elements in lowercase, in their order of appearance.
Examples
Input                                      Output
Java C# PHP PHP JAVA C java                java c# c
3 5 5 hi pi HO Hi 5 ho 3 hi pi             5 hi
a a A SQL xx a xx a A a XX c               a sql xx c

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

namespace _02OddOccurrences
{
    class Program
    {
        static void Main(string[] args)
        {
            var words = Console.ReadLine().ToLower().Split().ToArray();
            var counts = new Dictionary<string, int>();

            foreach (var item in words)
            {
                if (counts.ContainsKey(item))
                {
                    counts[item]++;
                }
                else
                {
                    counts.Add(item, 1);
                }
            }
            foreach (var item in counts)
            {
                if (item.Value % 2 != 0)
                {
                    Console.Write(item.Key + " ");
                }
            }
            Console.WriteLine();
        }
    }
}