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.

['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']
41504

['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']
74579

['r', '6647', 'W', 'v', '6941']

13588