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: ['o', 'J', 'B', '7765', '7781', '5513', '8721', 'u', '9557', 'C', 'A', '1281', '6565', 'H', '5559', '1695', '7577']
Example Output: 62014

Example Input: ['1693', '9237', '7591', '1593', 'R', '6295', '9379']
Example Output: 35788

Example Input: ['X', '9983', 'n']
Example Output:
9983