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:
['w', 'I', 't', '813', 'K', '5785']

Ex Output:
6598


Ex Input:
['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']

Ex Output:
14578


Ex Input:
['6567', 'P', '6081']

Ex Output:

12648