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:
['Z', '6245', 'N', '1403', 'b']

Ex Output:
7648


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:
['5085', '8209', 'i', 'M', '4497', 'f', 'c', 'F', '391', 'd', '4525', 'k', '6203', 'u']

Ex Output:

28910