static void Main(string[] args)
{
if (args.Length < 1)
{
ExitWithMessage("please provide a day.");
}
Challenge = LoadChallenge(int.Parse(args[0]));
if (Challenge.LoadInput())
{
Challenge.Solve();
}
else
{
ExitWithMessage($"could not find input file for challenge number {Challenge.Day}");
}
}
