using System;

​

namespace ConsoleApp38

{

    public class Shape

    {

        public interface Shapes

        {

            int GetArea();

            int getPerimeter();

​

        }

    }

   public class Square: Shape

    {

        int side ;

        public Square(int s)

        {

            side = s;

​

        }

        public int GetArea()

        {

            return side * side;

        }

    }

    public class Program

    {

        public static void Main(string[] args)

        {

           Square s = new Square( 4);

            Console.WriteLine("Square: ");

            Console.WriteLine("Area: " + s.GetArea());

        }

    }

}