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: ['f', 'F', 'E', '2279', 'r', '6419', 'd', 'M', '3975', '3797', '9201', 'F', 'c', '4753', '959', 'v', '8963', '4007']
Example Output: 44353

Example Input: ['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']
Example Output: 55013

Example Input: ['7457', '577', '2553', 'w', '2185', 'X', 'V', 'U', '8223', 'M', '397']
Example Output:
21392