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: ['J', '5149', 'H', 'L', 'm', 'h', '3863', 'n', 'z']
Example Output: 9012

Example Input: ['2067', '1523', 'b', '4219', '5043']
Example Output:
12852