Get list of variables

Hello,
I need a macro to generate a list of all the variables within a formula in a cell.
The list should not include any of the Excel formulas or operators.
Example, my cell contains the following formula:
=(SQRT(Area)+2 * Perim- Lenght Total)*Count^2
The list in this case is:
Area
Perim
Lenght Total 'notice the space
Count
Thanks in advance!