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: ['I', '1941', '2423', '3381', 'J', '6589', 'h', 'D']
Example Output: 14334

Example Input: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']
Example Output: 33794

Example Input: ['2625', '9085', 'f', 'x', '9539', '3855', '3855', 't', 'W', 'h', '3541', '3413', 'W', '489']
Example Output:
36402