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:
['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']

Ex Output:
18387


Ex Input:
['m', '3481']

Ex Output:
3481


Ex Input:
['U', '7695', 'D', 'k', '9219', '3277', '3471', '5923', 'B', '1829']

Ex Output:

31414