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: ['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']
Example Output: 23791

Example Input: ['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']
Example Output: 28458

Example Input: ['Q', '219', 'K', 'M', 'z', '8001', '5977', '3811', 'Z', 's', 'H', '6707', '9593', 'w', '489', 'z', '4669', '7009', 'N']
Example Output:
46475