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: ['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']
Example Output: 14077

Example Input: ['x', 'd', '5121', 'I', '6737', '3789', '6167', 'C', '8947', 'k', '4715', '1885', 'H', 'B', '5685', 'S', '4615', 's', '7709']
Example Output: 55370

Example Input: ['p', 'U', 'y', '3941', 'w', 's', 'V', '5821', '955', 'n', 'p', 'w', '3219', 'v']
Example Output:
13936