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:
['n', 'G', '5059', '8343', '8673', 'P', 'N', '5485', '2279', '6121', 'i', 'U', '7277', '8701', 'A', 'b', 'Z', 'R', '6371', 'G']

Ex Output:
58309


Ex Input:
['507', 'P', '9697', 'u', '5057']

Ex Output:
15261


Ex Input:
['v', '507', 'V', 'q', 'i', 'e', '1945', '2009', '7705', 'n', 'D', 'u', '613', 'F', 'R', '6263', 'A', '4199', 's', 'k']

Ex Output:

23241