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: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']
Example Output: 32029

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

Example Input: ['S', 'q', 'n', '8817', 'q', '3907', 'c', '943', '3925', '9901']
Example Output:
27493