Autodesk Revit - Add-on / or script

I need a add-on or script / program, to work in Autodesk Revit. The scirpt/add-on will need to calculate brick coursing in elevations, based on 0.0 being the RL, then the brick coursing calculated. I can provide the sizing of the bricks to be calculated. eg. R.L 0.00 = 0 brick courses R.L 0.60 = 7 brick courses. So i need the text to write "7c" - in a text box instead of "R.L 0.60"