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:
['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']

Ex Output:
35388


Ex Input:
['A', '9785', '1739', 'x', '2389', 'O', 'J', '1407', '9067', 'x', '9747', '2485', '4631', '6021', '4077', '2779', 'V', '2449', '7401']

Ex Output:
63977


Ex Input:
['L', '6977', '5915', '3519', '2231', 'L', 'b', '9319', '7105', '7553', '4687', '4639', 'c', '1539', '5215']

Ex Output:

58699