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:
['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

Ex Output:
27756

Ex Input:
['K', 'K', 'A', 'H', 'd', '7443', 'l', '659', 'x', 'D', '193']

Ex Output:
8295