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:
['l', 'V']

Ex Output:
0


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:
['s', '6911', '5777', '1389', 'f', '2707', 'i', 'r', 'S', 'a', 'm', 'B', 'W', '7987']

Ex Output:

24771