public class Point2D<T>
{
    public T x;

    public T y;

    public Point2D(T x, T y)
    {
        this.x = x;
        this.y = y;
    }
}

public class Z<T> : Point2D<T>
{
    public T z { get; set; }

    public Z(T x, T y, T z) : base(x, y)
    {
        this.z = z;
    }
}

public class Point3D<T> : Z<T>
{
    public Point3D(T x, T y, T z) : base(x, y, z)
    {
    }

    public string GetPoint()
    {
        return "x +" + x + " y +" + y + " z +" + z;
    }
}

public static class Program
{

    public static void Main(string[] args)
    {


        Console.WriteLine(array[0].GetName());

        Point3D<int> point1 = new Point3D<int>(1, 5, 3);
        Point3D<char> point2 = new Point3D<char>('4', '1', '2');
        Point3D<string> point3 = new Point3D<string>("5", "4", "2");
        Point3D<float> point4 = new Point3D<float>(5f, 4f, 2f);

        Console.WriteLine(point1.GetPoint());
        Console.WriteLine(point2.GetPoint());
        // Console.WriteLine(point3.GetPoint());
    }
}