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: ['n', 'm', 'Y', 'v']
Example Output: 0

Example Input: ['9069', '8333', 'H', '2049', '8051', 'L', '2749', '8819', '2883', '9317', 'M', '6515']
Example Output: 57785

Example Input: ['y', '8755', '3147', '8985', 'H', '8349', 'U', 'O', '7153', '7051', '9313', 'f', '4303', '2627', '7555', 'E', 'x', '5809', '6469']
Example Output:
79516