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: ['x', '1887', 'E', '3995', '5677', '2749', '9951']
Example Output: 24259

Example Input: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']
Example Output: 41504

Example Input: ['S', 'W', '2171', '6405', 'h', 'C', '1597', '7109', 'Q', 'p', '2747', 't', 'J', 'q', '1883', 'v', 'O']
Example Output:
21912