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.

Example Input: ['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']
Example Output: 9898

Example Input: ['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']
Example Output: 39416

Example Input: ['5671', 'M', '5169', '4515', 'G', '3569', 'D', 'p', '5403', 'S', '6823', 's', '8043', 'M']
Example Output:
39193