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: ['A', 'y', 'u', 'S']
Example Output: 0

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: ['E', '6025', 'T', '6483', '7253', 'i', 'z', 'k', 'v', 'W', 'x', 'v']
Example Output:
19761