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:
['Y', 'X']

Ex Output:
0


Ex Input:
['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']

Ex Output:
32421


Ex Input:
['2045', '499', '3759', '6193', '1837', 'y', 'y', 'w', '5509', '253', 'N', 'i', 'G', '273', '4179', '9465', '4129', 'F', '715']

Ex Output:

38856