Dictionaries 01 Odd Occurrences

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ArraysAndLists
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, int> words = new Dictionary<string, int>();
            string[] wordsInput = Console.ReadLine().Split(' ');

            for(int i =0; i < wordsInput.Length; i++)
            {
                if(!words.ContainsKey(wordsInput[i].ToLower()))
                {
                    words.Add(wordsInput[i].ToLower(), 0);
                }
                words[wordsInput[i].ToLower()]++;
            }
            List<string> result = new List<string>();
            foreach(KeyValuePair<string, int> word in words)
            {
                if(word.Value % 2 == 1)
                {
                    result.Add(word.Key);
                }
            }
            Console.WriteLine(string.Join(", ", result));
        }
    }
}