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', 'V', '3359', '8847', '7551', '2481', 'Y', 'j', 'L', 'G', '7905', 'v', '4141', '2229', 'k', 'H', '3517', '3885', '3665', 'O']

Ex Output:
47580


Ex Input:
['5499', '39', 'Q', 'b', 'W', '7155', '2515']

Ex Output:
15208


Ex Input:
['7199', '5971', '3775', '4265', '7727', '9657', '2297', 'K', 'W', '6777', 's', '8759', 'c', '621', 'R', 'J', '9413']

Ex Output:

66461