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: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
Example Output: 26791

Example Input: ['7959', '1345', '4605', '6453', 'Q']
Example Output: 20362

Example Input: ['s', 'Z', '3533', 's', '4383', '4565', '3897', '2893', '7515', '2715', 'f', 'c', '9949', '3545']
Example Output:
42995