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.

['K', '5815', 'E', 'c', '7379', '4995', 'w', 'B', 'j', '6227', 'B', '733', '1491', '3191', '9413', '2751', 'O', 'J', '6239', '3521']
51755

['8683', 'p', '47', '8983', 'g', 'u']
17713

['799', 'C', 'a', '9653', '3317', '7841', '4419', 'j', '5783', '3041', 'g', 'T', 'b', '7821', '7139', 'Q', '5113']

54926