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: ['W', '3629', '6053', '1035', '1717', 'n', 'y', '9585', 'D', '5125', 's', '9801', '2905', 'E', '5797', 'T']
Example Output: 45647

Example Input: ['q', '867', 'e', 'z']
Example Output: 867

Example Input: ['d', 'H', '9739']
Example Output:
9739