Phonebook

using System;
using System.Collections.Generic;
class Phonebook
{
    static void Main()
    {
        var phonebook = new Dictionary<string, string>();

        var input = Console.ReadLine()
            .Trim()
            .Split(new char[] { ' ', '-','\t' }, StringSplitOptions.RemoveEmptyEntries);
        while (input[0]!="search")
        {
            if (!phonebook.ContainsKey(input[0]))
            {
                phonebook[input[0]] = "";
            }
            phonebook[input[0]] = input[1];
            input = Console.ReadLine()
                .Trim()
                .Split(new char[] { ' ', '-','\t' }, StringSplitOptions.RemoveEmptyEntries);
        }

        input = Console.ReadLine()
            .Trim()
            .Split(new char[] { ' ', '-','\t' }, StringSplitOptions.RemoveEmptyEntries);

        while (input[0] != "stop")
        {
            if (!phonebook.ContainsKey(input[0]))
            {
                Console.WriteLine($"Contact {input[0]} does not exist.");
            }
            else
            {
                Console.WriteLine($"{input[0]} -> {phonebook[input[0]]}");
            }
            input = Console.ReadLine()
                .Trim()
                .Split(new char[] { ' ', '-','\t' }, StringSplitOptions.RemoveEmptyEntries);

        }


    }
}