C# 2.8.Company_Users

using System;
using System.Collections.Generic;

namespace _2._8.Company_Users
{
    class Program
    {
        static void Main()
        {
            SortedDictionary<string, List<string>> companies = new SortedDictionary<string, List<string>>();


            while (true)
            {
                string[] commnad = Console.ReadLine().Split(new char[] { ' ', '-', '>' }, StringSplitOptions.RemoveEmptyEntries);

                if (commnad[0] == "End")
                {
                    break;
                }

                if (!companies.ContainsKey(commnad[0]))
                {
                    companies.Add(commnad[0], new List<string>() { commnad[1] });
                }
                else
                {
                    if (!companies[commnad[0]].Contains(commnad[1]))
                    {
                        companies[commnad[0]].Add(commnad[1]);
                    }
                }
            }

            foreach (var kvp in companies)
            {
                Console.WriteLine($"{kvp.Key}");

                foreach (var id in kvp.Value)
                {
                    Console.WriteLine($"-- {id}");
                }
            }
        }
    }
}