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

Example Input: ['b', 'W', 'V', 'R', '3761', 'U', '4553', '1803', 'W', '7775', '1067', 'Y', 'D', '3159']
Example Output: 22118

Example Input: ['W', 'H', '4293', '7507', 'h', '6327', 'f', 'Z', 'e']
Example Output:
18127