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.

['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']
27756

['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
5636

['H', 'D', 'G']

0