using System;

using System.Linq;

using System.Collections.Generic;

​

class MainClass {

  abstract class Shape { }

​

  class Square : Shape

  {

      public string kvadratnost = "kvadrat";

  }

​

  class Circle : Shape

  {

      public string kruglost = "mihail";

  }

​

  private static string FormaEbat(Shape s)

  {

      throw new Exception("ti debil?");

  }

​

  private static string FormaEbat(Square s) => s.kvadratnost;

​

  private static string FormaEbat(Circle s) => s.kruglost;

​

​

  private static List<string> Misha()

  {

      var shapes = new List<Shape>();

      shapes.Add(new Circle());

      shapes.Add(new Square());

​

      return shapes.Select(x => FormaEbat(x as dynamic) as string).ToList();

  }

​

  public static void Main (string[] args) {

    Console.WriteLine (string.Join(", ", Misha()));

  }

}