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: ['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']
Example Output: 56499

Example Input: ['5829', '9755', '67', 'F', '6347', 'p', 'i', 'X', 'z', 'o', '2321', 'F', '6145', 'B', '3903']
Example Output: 34367

Example Input: ['d', '7619', '7311', 'S', '3797', 'Y', '5053', 'P', '6303', '3119', '4865', 'y', 'N', 'U', 'Z', '3771', '265', 'c', '991']
Example Output:
43094