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: ['8207', '4791', '3925', 'b', 'Z', '8471', '9215', '3117', 'p', '9095', 'h', 'k', 'E', 'h', '6047']
Example Output: 52868

Example Input: ['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
Example Output: 8317

Example Input: ['H', 'K', '1761', '729', '7363', 'x', 'P', 'B', '6925', '6057', '7049', 's']
Example Output:
29884