SoftUni Parking

using System;
using System.Collections.Generic;

namespace SoftUni_Parking
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the number of lines you are about to enter: ");
            int lines = int.Parse(Console.ReadLine());
            Dictionary<string, string> parkingDictionary = new Dictionary<string, string>();
            for(int i = 0; i < lines; i++)
            {
                string[] input = Console.ReadLine().Split();
                string command = input[0];
                string username = input[1];
                if(command == "register")
                {
                    string licensePlateNumber = input[2];
                    if (parkingDictionary.ContainsKey(username))
                    {
                        Console.WriteLine("ERROR: already registered with plate number " + parkingDictionary[username]);
                    }
                    else
                    {
                        parkingDictionary.Add(username, licensePlateNumber);
                        Console.WriteLine($"{username} registered {licensePlateNumber} successfully.");
                    }
                }
                else
                {
                    if (parkingDictionary.ContainsKey(username))
                    {
                        parkingDictionary.Remove(username);
                        Console.WriteLine($"{username} unregistered successfully.");
                    }
                    else
                    {
                        Console.WriteLine($"ERROR: user {username} not found.");
                    }
                }

                foreach (var item in parkingDictionary)
                {
                    Console.WriteLine(item.Key + " => " + item.Value);
                }
            }
        }
    }
}