using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        var rot = Rotina();

        while(rot.MoveNext()){

            Console.WriteLine($"Next: {rot.Current}");

        }

    }

    static IEnumerator Rotina()

    {

        for (int i = 0; i < 10; i++)

        {

            yield return 0;

        }

        yield return "Ok";

    }

}