Phonebook

using System;
using System.Collections.Generic;
using System.Linq;
namespace Dictionaries__Lambda__Linq_Exercise
{
    public class PhoneBook
    {
        public static void Main(string[] args)
        {
            var phonebook = new SortedDictionary<string, string>();


            var input = Console.ReadLine().Split().ToList();

            while (input[0]!="END")
            {

                if (input[0] == "A")
                {
                    phonebook[input[1]] = input[2];
                }
                else if (input[0] == "S")
                {
                    if (phonebook.ContainsKey(input[1]))
                    {
                        Console.WriteLine($"{input[1]} -> {phonebook[input[1]].ToString()}");
                    }
                    else
                    {
                        Console.WriteLine($"Contact {input[1]} does not exist.");
                    }
                }
                input = Console.ReadLine().Split().ToList();
            }
        }
    }
}