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:
['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']

Ex Output:
23475


Ex Input:
['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

Ex Output:
28458


Ex Input:
['2893', 'A', '6647', '6725', '4277', '429', '3083', 'F', 'I', 'E', '6297', '5883', '5141', 'b', 'l', '9575', 'S']

Ex Output:

50950