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:
['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']

Ex Output:
27899

Ex Input:
['7361', '3605', 'V', '2039', '9665', 'X', 'b', '1195', '657', '6509', '7195', '2013', '1847', 'v', '9499', '1761']

Ex Output:
53346

Ex Input:
['n', 's', 'X', 'B', '8391', 'P', 'b', 't', 'L', '3675', '4419', 'I', 'b', '1257']

Ex Output:
17742