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: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']
Example Output: 6713

Example Input: ['G', 'Z', '4819', '9763', '9987']
Example Output: 24569

Example Input: ['6055', '4757', 'y', '1685', 'm', 'T', 'L', '9149', 'Q', '1169', '47']
Example Output:
22862