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:
['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

Ex Output:
39896


Ex Input:
['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']

Ex Output:
25220


Ex Input:
['A', '5263', '8973', '3295', 'c', '1477', 'Q', 'N', 'H', '8629', 'B']

Ex Output:

27637