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: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
Example Output: 33865

Example Input: ['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']
Example Output:
33416