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:
['2787', 'z', '9351', '3339']

Ex Output:
15477


Ex Input:
['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']

Ex Output:
20070


Ex Input:
['8895', '3313', '3413', '831', 'A', '1445']

Ex Output:

17897