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: ['1969', 'm', 'Y', 'N', '7331', 'J', 'b', '2485', 'x']
Example Output: 11785

Example Input: ['U', '5607', 'Q', 'j', 'I', '3745', '3031']
Example Output: 12383

Example Input: ['3463', '6295', 'T', 'o', 'L', 'Q']
Example Output:
9758