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:
['z', 'T', 'Y', 's', 'j', '585', '7833', '2601', '8057', 'S', '7037', '5799', '4477', '5377', '6301', 'P', 'm', '9431', 'f']

Ex Output:
57498


Ex Input:
['O', '6337', 'j', '6009', 'z']

Ex Output:
12346


Ex Input:
['2283', '5385', 'n', 'P']

Ex Output:

7668