WordSynonyms-withDictionary

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

namespace WordSynonyms
{
    class MainClass
    {
        public static void Main()
        {
            int number = int.Parse(Console.ReadLine());
            var dictionary = new Dictionary<string, List<string>>();

            for (int i = 0; i <= number-1; i++)
            {
                string word = Console.ReadLine().ToLower();
                string synonyms = Console.ReadLine().ToLower();

                if (dictionary.ContainsKey(word) == false)
                {
                    dictionary[word] = new List<string>();
                    dictionary[word].Add(synonyms);
                }

                else
                {
                    dictionary[word].Add(synonyms);
                }
            }

            foreach (var item in dictionary)
            {
                Console.WriteLine($"{item.Key} - {string.Join(", ",item.Value)}");
            }

        }

     }

    }