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: ['Y', '263', '641', '1163', 'p', 'r', 'L', '4425', 'C', '7585']
Example Output: 14077

Example Input: ['6329', '8695', 'p', 'H', '1587', 'n', '9873', '6445', 'b', 't', '6677', '2095', 'e', 'F', 'm', 's', '4753']
Example Output:
46454