using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Net.Http;

using System.Text;

using System.Threading.Tasks;

​

namespace Test

{

    class Program

    {

        static void Main(string[] args)

        {

​

            var passwordCharacters = new List<Tuple<int, char>>();

            var httpClient = new HttpClient();

            var endpointUrl = "https://enigmatic-plains-7414.herokuapp.com";

​

​

            var resultStream = httpClient.GetStreamAsync(endpointUrl).Result;

​

            using (var streamReader = new StreamReader(resultStream, Encoding.UTF8))

            {

                var lineAccumulator = new List<string>();

                while (!streamReader.EndOfStream)

                {

                    var buffer = streamReader.ReadLine();

                    lineAccumulator.Add(buffer);

​

                    if (String.IsNullOrWhiteSpace(buffer))

                    {

                        //process

                        var passwordCharacter = ProcessPasswordCharacterChunk(lineAccumulator);

                        passwordCharacters.Add(passwordCharacter);

                        //reset

                        lineAccumulator.Clear();

                    }

                }

            }

​

            var password = new String(passwordCharacters.OrderBy(x => x.Item1).Select(x => x.Item2).ToArray());

​

            Console.WriteLine(password);

        }

​

        private static Tuple<int,char> ProcessPasswordCharacterChunk(List<string> accumulator)

        {

            var indexOfPasswordCharacter = Int32.Parse(accumulator[0]);

            var trimmedCoordinates = accumulator[1].TrimStart('[').TrimEnd(']');

            var yCoord = Int32.Parse(trimmedCoordinates.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)[0].Trim());

            var xCoord = Int32.Parse(trimmedCoordinates.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)[1].Trim());

​

            //working from bottom of the list to top

            var passwordChar = accumulator[accumulator.Count() - xCoord - 2][yCoord];

            return new Tuple<int, char>(indexOfPasswordCharacter, passwordChar);

        }

    }

}

​