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: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']
Example Output: 35458

Example Input: ['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']
Example Output: 20002

Example Input: ['q', '1237', '9243', '1665', 'i', '5803', '3951', '4121', '4743', 'i', '8393', '1545', 'L', 'g', 'B']
Example Output:
40701