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

Example Input: ['G', 'e', 'R', '4427', '3401', '3065', 'I', '2781', '6829', '5261']
Example Output: 25764

Example Input: ['v', '2123', '151', 'E', '9887']
Example Output:
12161