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: ['l', 'B', 'Y', '7543', '5091', '1917']
Example Output: 14551

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

Example Input: ['K', 'O', '9547', 'Y', '4517', '9297', '631', '6977', '1193', '3455', '8771', 'c', '945', 'Q', 'U', '9111', 'q', '6391', '4023', 'S']
Example Output:
64858