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: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']
Example Output: 32029

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

Example Input: ['m', 'c', 'D', 'N', 'r', '7337']
Example Output:
7337