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.

Ex Input:
['4607', 'T', 'a', '6077', 'c', '4761']

Ex Output:
15445


Ex Input:
['4437', '1265', '1519', 'K', 'Q', 'b', 'n', 'J', '6631', 'K', 'q', 'D', 'U', 'u', '3653', '5169', 'L', 's']

Ex Output:
22674


Ex Input:
['s', '1779', 'Y', '2509', 'J', '4947', 'n', 'Q', '5353', '3943', 'y', 'U', 'k', '8509', '859', 'a', '3673']

Ex Output:

31572