public static void Main()
{
HashTable <string, string> phonebook = new HashTable <string, string>();
string input;
while ((input = Console.ReadLine()) != "search")
{
var data = input.Split('-');
phonebook.Add(data[0], data[1]);
}
while ((input = Console.ReadLine()) != "end")
{
if (phonebook.ContainsKey(input))
{
Console.WriteLine($"{input} -> {phonebook[input]}");
}
else
{
Console.WriteLine($"Contact {input} does not exist.");
}
}
}