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: ['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']
Example Output: 24749

Example Input: ['f', 'F', 'E', '2279', 'r', '6419', 'd', 'M', '3975', '3797', '9201', 'F', 'c', '4753', '959', 'v', '8963', '4007']
Example Output: 44353

Example Input: ['4451', '9719', '149', 'p', '5483', 'Q', '6135', 'j', '2515', 'Y', 'X', '6103', '8599']
Example Output:
43154