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: ['b', 's', 'v', '4757', '9063', 'I', '8397', '7975', 'Q']
Example Output: 30192

Example Input: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']
Example Output: 36604

Example Input: ['8517', 'r', '6219', 'g', 'P', 'H', 'F', '5641', '8465']
Example Output:
28842