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: ['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']
Example Output: 42641

Example Input: ['z', '9173', 's', '8937', 'h', '1881', '7929', 'b', '2441']
Example Output: 30361

Example Input: ['o', 'W', '9107', 'v', 'X', 'F']
Example Output:
9107