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:
['8739', 'K']

Ex Output:
8739


Ex Input:
['5467', '3013', '8325', '4005', 'J', 'V', '395', '7477', 'E', 's', '1337', 'g', 'v', '8569', '9757', 'x', '3909', '2983', 's', '7917']

Ex Output:
63154


Ex Input:
['351', 'P', '1195', '6663', 'm', '7805', '3147', '1949', '6731', 'u', '8115', 'h', '451', '2883', '4921', '7637', 'L', 'E']

Ex Output:

51848