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: ['o', 'a', 'K', '6031']
Example Output: 6031

Example Input: ['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']
Example Output: 25298

Example Input: ['q', 'p', 'n', '9079', 'm', '9859', '4885', '4915', '793', 'v', 'J', 'Z', '8821', 'I', '277', '9013']
Example Output:
47642