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:
['c', '4501', 'O']

Ex Output:
4501


Ex Input:
['5829', '9755', '67', 'F', '6347', 'p', 'i', 'X', 'z', 'o', '2321', 'F', '6145', 'B', '3903']

Ex Output:
34367


Ex Input:
['9249', '5503', 'e', '9123', '6861', 'K', '4857', 'N', 'r', 'A', 'H', '8983', 'T', '5037', '6495', '5483']

Ex Output:

61591