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:
['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']

Ex Output:
5636


Ex Input:
['z', 'c', 'E', 'Q', '1839', 'g', 'X', 'c', '291', 'c', 'w', 'e', '5957', 'X', '6471', 'A', '8359', 'y', '3611', '5417']

Ex Output:
31945


Ex Input:
['2473', 'Z', 'n', 'R', 'H', '3381', '8857', 'x']

Ex Output:

14711