using System;

public class Program

{

     internal class Alpha

    {

        private int a1;

        private int a2;

        public int A2{get;set;}

        public int A1{get;set;}

        public Alpha(){}

        public Alpha(int c1,int c2)

        {

            A1=c1;

            A2=c2;

        }

    }

    class Beta:Alpha

    {

        private string b1;

        private string b2;

        public string B1{get;set;}

        public string B2{get;set;}

        public void Input()

        {

            Console.WriteLine(A1+"   "+A2);

        }

        public void Output()

        {

            Console.WriteLine(B1);

            Console.WriteLine(B2);

        }

        public Beta(){}

        public Beta(int c1,int c2, string d1, string d2):base (c1,c2)

        {

            B1=d1;

            B2=d2;

        }

    }

    public static void Main()

    {

        Beta bruh = new Beta(20,  30,  "Пловдив", "Барселона");

        bruh.Input();

        bruh.Output();

        Beta bro = new Beta(100,  200,  "София", "Лондон");

        bro.Input();

        bro.Output();

    }

}