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:
['q', '867', 'e', 'z']

Ex Output:
867


Ex Input:
['A', '771', 'Q', 'b', '9929', '4991', 'q', '9863', '4363', '5721', 'C', '991', 'j', 'r', 'Q', 'B', 'K']

Ex Output:
36629


Ex Input:
['129', '7509', '9175', '1313', '6619', 't', 'C', '1797', '8247', 'p', '5063', '2137']

Ex Output:

41989