private static void Main()
{
var ticketCatalog = new TicketCatalog();
while (true)
{
string line = Console.ReadLine();
if (line == null)
{
break;
}
line = line.Trim();
string commandResult = ticketCatalog.ExecuteInputCommand(line);
if (commandResult != null)
{
Console.WriteLine(commandResult);
}
}
}