Dict-Ref-Advanced

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

namespace ConsoleApplication18
{
    class Program
    {
        static bool IsName(string input)
        {
            foreach(char ch in input)
            {
                if (char.IsLetter(ch))
                {
                    return true;
                }
            }
            return false;
        }
        static void Main(string[] args)
        {
            var data = new Dictionary<string, List<int>>();
            string input = Console.ReadLine();
            while(input!="end")
            {
                string[] inputTokens = input.Split(new string[] { " -> " }, StringSplitOptions.RemoveEmptyEntries);
                string name = inputTokens[0];
                if (IsName(inputTokens[1]))
                {
                    string otherName = inputTokens[1];
                    if (data.ContainsKey(otherName))
                    {
                        List<int> otherNumbers = data[otherName];
                        data[name].Clear();
                        data[name].AddRange(otherNumbers);
                    }
                }
                else
                {
                    int[] numbers = inputTokens[1]
                   .Split(new string[] { ", " }, StringSplitOptions.RemoveEmptyEntries)
                   .Select(int.Parse).ToArray();
                    if (!data.ContainsKey(name))
                    {
                        data.Add(name, new List<int>());
                    }
                    data[name].AddRange(numbers);
                }
                input = Console.ReadLine();
            }
            foreach(var record in data)
            {
                string name = record.Key;
                List<int> numbers = record.Value;
                Console.WriteLine("{0} === {1}", name, string.Join(", ", numbers));
            }
        }
    }
}