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.
['t', '7015', '2239', 'I', 'F', 'E', '1363', '9615', '6179', '2539', 'z', '8745', '1319', '4715', '9071', 'K', '3707', '6149', 'd']