using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        if (args.Length == 0)
        {
            Console.WriteLine("Usage: dotnet run -- ex1|ex2|ex3|ex4|ex5|ex6");
            return;
        }

        switch (args[0].ToLower())
        {
            case "ex1":
                await Ex1.Run();
                break;
            case "ex2":
                await Ex2.Run();
                break;
            case "ex3":
                await Ex3.Run();
                break;
            case "ex4":
                await Ex4.Run();
                break;
            case "ex5":
                await Ex5.Run();
                break;
            case "ex6":
                await Ex6.Run();
                break;
            default:
                Console.WriteLine($"Unknown example: {args[0]}");
                break;
        }
    }
}