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: ['w', '2281', '8651', '2203', 'q', 'n', '4253']
Example Output: 17388

Example Input: ['6201', '2005', '3791', 'T', 'h', 'K', 'c', '9329', '2507', 'e', 'o', '5763', '8229', '803', '4549', 'R']
Example Output:
43177