Isolate the last 4 digits in a cell

I need to isolate the last 3 or 4 digits of a string in a cell.
Here is what I am trying to do:

Machines - North America - 227B

Last four digits indicate the Model number and I just need the model number. I have about 96 models that I need to copy the same command.

I know there is a command that can do it. Could you please help?

Thanks for your help.

BGN2

Yes. Thank you.