Dict - Ref - Nested dict

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

namespace Dict_Ref_Advanced
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, List<int>> dictionary = new Dictionary<string, List<int>>();
            string inputLine = Console.ReadLine();
            while (inputLine != "end")
            {
                string[] inputData = inputLine.Split(new[] { ' ', '-', '>', ',' }, StringSplitOptions.RemoveEmptyEntries);
                string currentKey = inputData[0];
                var firstValue = -1;
                if (int.TryParse(inputData[1], out firstValue))
                {
                    if (!dictionary.ContainsKey(currentKey))
                    {
                        dictionary[currentKey] = new List<int>();
                    }
                    for (int i = 1; i < inputData.Length; i++)
                    {
                        dictionary[currentKey].Add(int.Parse(inputData[i]));
                    }
                }
                else
                {
                    string otherKey = inputData[1];
                    if (dictionary.ContainsKey(otherKey))
                    {
                        dictionary[currentKey] = new List<int>(dictionary[otherKey]);
                    }
                }
                inputLine = Console.ReadLine();
            }//end while
            foreach (var entry in dictionary)
            {
                Console.WriteLine("{0} === {1}", entry.Key, string.Join(", ", entry.Value));
            }

        }
    }
}