In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.
['655', 'G', 'q', '8497', '2687', 'O', '1241', '8917', '9009', '8747', 'V', 'F', '5165', '4817', 'n', 'S', '3663', '4601']