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:
['2871', '1337', '3771', '4671', 'l', '3785', 'V', 'z', 'R', 'u', '6097', 'R', '4297', 'd', '6339', 'Y', 'V', '5873', '7399']

Ex Output:
46440


Ex Input:
['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']

Ex Output:
8317


Ex Input:
['6515', '5525', 'o', 'Q', '9049', 'f', 'p', 'X', '2057', 'h', '7585', '3617', '7817']

Ex Output:

42165