Forums Scripts & Popups Optional parameters in the middle

Thanks

Now I have a big problem. These are the new possibilities:

!calc 1 2 3 A Land Cruiser
Result: ((1*x + 2*y + 3*z) * A) * %calc.points.LandCruiser

!calc 1 B Monte Carlo
Result: ((1*x) * B) * %calc.points.MonteCarlo

The quantity of numbers will vary, after them only A,B,C,D are allowed and finally a name is needed (which can be 1-3 words)

How can I make the last numbers optional with this?

thanks for the help