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:
['s', '407', '7983', '1523', '8983', '9841', 'p', 'y', 'N', '7633', 'T', '4177', 'Z', 'Y', '3223', '7125', '2601', '7467', '3039']

Ex Output:
64002


Ex Input:
['B', 's']

Ex Output:

0