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:
['D', 'R', 'Y', '4929', 'P', '7929']

Ex Output:
12858


Ex Input:
['3319', 'e', 'c', 'G', '2399', '1557', '4813', 'z', 'U', '4895', 's', '1193', 'A', 'G']

Ex Output:
18176


Ex Input:
['x', 'd', '9439', '6843', 'H', 'g', '6265', 'g', 'a', 'o', '5985', 'B', 'e', '5131']

Ex Output:

33663