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:
['1203', '6179', '9835']

Ex Output:
17217


Ex Input:
['3839', 'D', '4741', 'L']

Ex Output:
8580


Ex Input:
['8983', '4043', 'n', '3917', 'G', 'W', '9085', '1799', 'i', 'I', '5929', 'Y', 'w']

Ex Output:

33756