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:
['I', 'J', 'K', 'D', '5961']

Ex Output:
5961


Ex Input:
['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']

Ex Output:
42558


Ex Input:
['C', '9223', '5853', '1649', '5303', '9689', '6591', '8739', 'k', 'M', '4289', '8835', '4675', '9571', '7775', '7193', '9683', '3569', '7881']

Ex Output:

110518