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: ['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']
Example Output: 20070

Example Input: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']
Example Output: 41628

Example Input: ['3229', 'p', '1549', 'n', '9057', 'j', '3067', '5843', '1715', '4659', '2139', 'I', '2211', '9479', '495', 'm']
Example Output:
43443