using System;

internal static class Program
{
    private static void Main(string[] args)
    {
        SessionFormat[] formats = { new InPerson(), new Remote() };
        foreach (SessionFormat format in formats) Console.WriteLine(format.Description());
    }
}

internal abstract class SessionFormat
{
    protected abstract string Location { get; }
    public string Description() => "Workshop: " + Location;
}
internal sealed class InPerson : SessionFormat { protected override string Location => "Studio"; }
internal sealed class Remote : SessionFormat { protected override string Location => "Online"; }