public static void Main()
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
ShoppingCenter center = new ShoppingCenter();
StringBuilder answer = new StringBuilder();
int commands = int.Parse(Console.ReadLine());
for (int i = 1; i <= commands; i++)
{
string command = Console.ReadLine();
string commandResult = center.ProcessCommand(command);
answer.AppendLine(commandResult);
}
Console.Write(answer);
}