phonebook

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Phonebook
{
    class Program
    {
        static Dictionary<string, string> phonebook = new Dictionary<string, string>();

        static void Main()
        {
            string arr = Console.ReadLine();
            List<string> arrInput = arr.Trim().Split(' ').ToList();

            while (arr!="END")
            {
                arrInput = arr.Trim().Split(' ').ToList();
                if (arrInput[0].Equals("A"))
                {
                    if (phonebook.ContainsKey(arrInput[1]))
                    {
                        phonebook[arrInput[1]] = arrInput[2];
                    }
                    else
                    {
                        phonebook.Add(arrInput[1], arrInput[2]);
                    }
                }
                if (arrInput[0].Equals("S"))
                {
                    if (phonebook.ContainsKey(arrInput[1]))
                    {
                        Console.WriteLine("{0} -> {1}", arrInput[1], phonebook[arrInput[1]]);
                    }
                    else
                    {
                        Console.WriteLine("Contact {0} does not exist.", arrInput[1]);
                    }
                }
                arr = Console.ReadLine();
                if (arr == "END")
                {
                    break;
                }
            }

        }
    }
}