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: ['1969', 'm', 'Y', 'N', '7331', 'J', 'b', '2485', 'x']
Example Output: 11785

Example Input: ['6723', '1', '6357', '1497', 'A', 'p', 'N', 'T']
Example Output: 14578

Example Input: ['L', 'k', '8661', 'Y', '4229', '1229', '7035', 'z', 'M', '8709', 'R', 'X', 'w', 'y', '6165', '6099', '7639', 'T']
Example Output:
49766