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:
['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']

Ex Output:
21509


Ex Input:
['Q', '2271', '1803', '2363']

Ex Output:
6437


Ex Input:
['V', '505', '9691', '4049', '1411', 'c', '1833', '7971', '6289', '9391', '6117', '2861']

Ex Output:

50118