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:
['N', 'e', '4283', '3243', '5581', '1407', 'q', 'y', '6685', 'v', 'c', '5995']

Ex Output:
27194


Ex Input:
['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']

Ex Output:
44213


Ex Input:
['H', 'T', '2579', '4555', 'q', 'u', 'K', 'Y', '4921', '89', 'r', 'w', '8609']

Ex Output:

20753