using System;

public class Program

{

    class Obdelnik

    {

        public double stranaA;

        public double stranaB;

        public Obdelnik(double a)

        {

        stranaA = a;

        stranaB = a;    

        }   

        public Obdelnik (double a, double b)

        {

        stranaA = a;

        stranaB = b;

        }   

        public string VratInformace()

        {   

            string text = "(a: " + stranaA + ", b: " + stranaB + ")";

            return text;

        }   

    }

    public static void Main()

    {

        Obdelnik obdelnik = new Ctverec (10);

        Console.WriteLine(ctverec.VratInformace());

        Obdelnik obdelnik = new Obdelnik (a: 10 , b: 20);

    }

}