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: ['e', '9777', '1835', 'N', '2425', '1427', 'o', '4459', '9961', '3285', '5199', 'x', 'e', '7727']
Example Output: 46095

Example Input: ['D', '8591', 'b', 'n', 'e', '883', '8923', '245', 'z', '5643', 'C', '2911', '9275', '711', '7299', '3449', '4799', '6065']
Example Output: 58794

Example Input: ['561', 'm', 'f', 'k', '6881', '7273', 'c', 'n', 'G', 'B']
Example Output:
14715