How to get selected object in vba powerpoint?

Question

PowerPoint

It is very necessary to compose a macro in VBA that would clear the format from the selected cells of the table inserted into PowerPoint (Office 2016 version).
Algorithm: I select with the mouse several cells in the table that is placed on the slide and click on the macro launch button. For selected cells, for example, black text color and white background are set.
How to get the currently selected objects so that you can work with them later?