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: ['L', 'i', '9225', 'w', '5365', '8077', '2733', 'W', '8493', 'B']
Example Output: 33893

Example Input: ['2039', '1679', '9675', 'S', 'J', '2069', 'r', 'e']
Example Output: 15462

Example Input: ['4057', '6489', 'X', '9383', '5193', 'e']
Example Output:
25122