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: ['187', 'J', 'l', 'p', '1009', 'g', '5817', 'V', 'B', 'Z', '3329', '9253']
Example Output: 19595

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

Example Input: ['3295', '3029', '6871', '8301', 'k', '7015', '4541', 'c']
Example Output:
33052