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:
['t', 'v', 'B', 'Y']

Ex Output:
0


Ex Input:
['J', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']

Ex Output:
28173


Ex Input:
['n', '9825', 'Q', 'v', 'T', '5781', '5531', '3185', 'A', '9641', 'L', 'y']

Ex Output:

33963