can't remove commas at the end of a string

[dschmitt]

In an Excel column I have strings of text. Some end with a comma. Others end without a comma. I want to remove all the commas at the end of the strings. How do I do that? Below is an example.

Column A
large building
small building,
skyscraper,
tall, house
house boat
cabin

Note: the comma after "tall" I don't want to remove.