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:
['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']

Ex Output:
74579


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:
['Z', 'U', 'R', '63', 'g', '2679', '9165', 'X', 'c', '8371', 'B', '6273', 'w', '2459', 'H', '7449', 'X', 'Q', 'P', 't']

Ex Output:

36459