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: ['4509', '4165', '8651', '8057', 'a', '2241', 't', 'i', 'q', 'S', '5149', 'J', 'j', '1373', 'W', 'X', '235', 'm', '3225']
Example Output: 37605

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

Example Input: ['6851', 'b', '9913', 'H']
Example Output:
16764