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: ['W', 'H', 'k', 'L', '2425']
Example Output: 2425

Example Input: ['4401', 'p', 'V', 'l', 'H', '7329', 's', '4717', 'l', '1773', '67', '179', 'l', '6991', 'a', '9377']
Example Output: 34834

Example Input: ['g', 'q', 'x', '2479', 'H', '1885', 'T', '4101', 'j', 'd', '2903', 'A', 'n', '6877', 'P', '3837']
Example Output:
22082