using System;

public class Program

{

    public static void Main()

    {

        new ExtendedNeco(1,2);

    }

}

​

public class NecoBase

{

    protected int a, b;

    public NecoBase(int x, int y)

    {

        a = x;

        b = y;

    }

}

​

public class ExtendedNeco : NecoBase

{

    public ExtendedNeco(int x, int y) : base(x, y)

    {

        Console.WriteLine($"a: '{a}', b: '{b}'");

    }

}