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:
['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']

Ex Output:
34296


Ex Input:
['t', '7015', '2239', 'I', 'F', 'E', '1363', '9615', '6179', '2539', 'z', '8745', '1319', '4715', '9071', 'K', '3707', '6149', 'd']

Ex Output:
62656


Ex Input:
['5703', 'M', 'X']

Ex Output:

5703