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:
['1875', '9833', 'i', '7493', 'J', 'P', 'z']

Ex Output:
19201


Ex Input:
['d', 'b', 'W', '3201', 'C', 'o', '5187', '9723', '8177', 'F', '6703', 'U', '1393', '1035', '3507', '5993', '3857', 'r', 'C', 'j']

Ex Output:
48776


Ex Input:
['1771', 'x', 'd', 'B', 'x', '2967', 'o', 'u', '6235', 'U', '5389', '9443', 'z', '7731', 'n', '9467', 'u']

Ex Output:

43003