Dictionaries_Lambda_Expressions_LINQ - 01. Phonebook

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

namespace _07b_Dictionaries_Lambda_Expressions_LINQ_Exercises
{
    class Dictionaries_Lambda_Expressions_LINQ_Exercises
    {
       static void Main(string[] args)
        {
            List<string> commands = Console.ReadLine().Split().ToList();
            Dictionary<string, string> contacts = new Dictionary<string, string>();

            while (commands[0] != "END")
            {
                if (commands[0] == "A")
                {
                    if (contacts.ContainsKey(commands[1]))
                    {
                        contacts[commands[1]] = commands[2];
                    }
                    else
                    {
                       contacts.Add(commands[1], commands[2]);
                    }

                }
                else if (commands[0] == "S")
                {
                        if (contacts.ContainsKey(commands[1]))
                        {
                            Console.WriteLine($"{commands[1]} -> {contacts[commands[1]]}");
                        }
                        else
                        {
                            Console.WriteLine($"Contact {commands[1]} does not exist.");
                        }
                }
                commands = Console.ReadLine().Split().ToList();
            }
        }
    }
}