ForceBook*

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

namespace HouseParty
{
    class Program
    {
        static void Main(string[] args)
        {
            var sidesUsersDictionary = new Dictionary<string, List<string>>();
            string input = string.Empty;
            while ((input = Console.ReadLine()) != "Lumpawaroo")
            {
                if (input.Contains('|'))
                {
                    string[] inputArray = input.Split(" | ");
                    string side = inputArray[0];
                    string user = inputArray[1];
                    bool userAlreadyExist = false;
                    foreach (var kvp in sidesUsersDictionary)
                    {
                        var currentList = kvp.Value;
                        if (currentList.Contains(user))
                        {
                            userAlreadyExist = true;
                            break;
                        }
                    }

                    if (userAlreadyExist == false && sidesUsersDictionary.ContainsKey(side) == false)
                    {
                        sidesUsersDictionary[side] = new List<string>();
                        sidesUsersDictionary[side].Add(user);
                    }

                    else if (userAlreadyExist == false && sidesUsersDictionary.ContainsKey(side) == true)
                    {
                        sidesUsersDictionary[side].Add(user);
                    }
                }

                else if (input.Contains("->"))
                {
                    string[] inputArray = input.Split(" -> ");
                    string user = inputArray[0];
                    string side = inputArray[1];
                    bool userAlreadyExist = false;
                    string sideWhereIsUser = string.Empty;
                    foreach (var kvp in sidesUsersDictionary)
                    {
                        var currentList = kvp.Value;
                        if (currentList.Contains(user))
                        {
                            userAlreadyExist = true;
                            sideWhereIsUser = kvp.Key;
                            break;
                        }
                    }

                    if (userAlreadyExist == false && sidesUsersDictionary.ContainsKey(side) == false)
                    {
                        sidesUsersDictionary[side] = new List<string>();
                        sidesUsersDictionary[side].Add(user);
                        PrintWhereUserJoined(user, side);
                    }

                    else if (userAlreadyExist == false && sidesUsersDictionary.ContainsKey(side) == true)
                    {
                        sidesUsersDictionary[side].Add(user);
                        PrintWhereUserJoined(user, side);
                    }

                    else if (userAlreadyExist == true && sidesUsersDictionary.ContainsKey(side) == false)
                    {
                        sidesUsersDictionary[sideWhereIsUser].Remove(user);
                        sidesUsersDictionary[side] = new List<string>();
                        sidesUsersDictionary[side].Add(user);
                        PrintWhereUserJoined(user, side);
                    }

                    else if (userAlreadyExist==true&& sidesUsersDictionary.ContainsKey(side)==true && sideWhereIsUser!=side)
                    {
                        sidesUsersDictionary[sideWhereIsUser].Remove(user);
                        sidesUsersDictionary[side].Add(user);
                        PrintWhereUserJoined(user, side);
                    }
                }
            }

            PrintAllUsersInAllForceSides(sidesUsersDictionary);
        }


        private static void PrintAllUsersInAllForceSides(Dictionary<string, List<string>> sidesUsersDictionary)
        {
            foreach (var kvp in sidesUsersDictionary.Where(x => x.Value.Count > 0).OrderByDescending(x => x.Value.Count)
                                                    .ThenBy(x => x.Key))
            {
                string side = kvp.Key;
                var listOfUser = kvp.Value;
                Console.WriteLine($"Side: {side}, Members: {listOfUser.Count()}");
                foreach (var users in listOfUser.OrderBy(x => x))
                {
                    Console.WriteLine($"! {users}");
                }
            }
         }

        private static void PrintWhereUserJoined(string user, string side)
        {
            Console.WriteLine($"{user} joins the {side} side!");
        }
    }
}