Users

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

namespace Project
{
    class Program
    {
        static void Main(string[] args)
        {
            var users = new Dictionary<string, List<string>>();

            while (true)
            {
                var input = Console.ReadLine();
                if (input == "Statistics")
                {
                    break;
                }

                var tokens = input
                    .Split("->", StringSplitOptions.RemoveEmptyEntries);

                var command = tokens[0];
                var name = tokens[1];
                switch (command)
                {
                    case "Add":
                        if (!users.ContainsKey(name))
                        {
                            users.Add(name, new List<string>());
                        }
                        else
                        {
                            Console.WriteLine($"{name} is already registered");
                        }
                        break;

                    case "Send":
                        var email = tokens[2];
                        users[name].Add(email);
                        break;

                    case "Delete":
                        if (users.ContainsKey(name))
                        {
                            users.Remove(name);
                        }
                        else
                        {
                            Console.WriteLine($"{name} not found");
                        }
                        break;
                }
            }

            Console.WriteLine($"Users count: {users.Count}");

            foreach (var user in users.OrderByDescending(x => x.Value.Count)
                .ThenBy(x => x.Key))
            {
                Console.WriteLine(user.Key);
                foreach (var email in user.Value)
                {
                    Console.WriteLine($"- " + email);
                }
            }
        }
    }
}