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: ['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']
Example Output: 27899

Example Input: ['4869', 'L']
Example Output: 4869

Example Input: ['m', '8389', 'w', 'X', '9027', '1477', 'l', '8607', '6759', 'Y', 'o', 'Q', 'X', 's', 'a', 'x']
Example Output:
34259