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: ['3839', 'D', '4741', 'L']
Example Output: 8580

Example Input: ['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']
Example Output: 20070

Example Input: ['9775', 'b', 'Z', '2369', 'v', '7485', '6041', '541', '9695', 's', '5515', 'T', 'j', '9813']
Example Output:
51234