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: ['7379', 'I', '2031', '8419', 'w', 'b', '9827', 'X', 'Y', 't', '3789', 'B', 'c', '6599', 'F', '6169', 'V']
Example Output: 44213

Example Input: ['5095', '8235', '4901', 's', '4177', '3077', 'l']
Example Output: 25485

Example Input: ['F', '4935', 'A', 'n', 'q', 'H', 'b', 'b', 'M', '5745', 'X', 'E', 'g', 'r', '4535', 'p', '3177', '4757', 'Z', '3449']
Example Output:
26598