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: ['X', '6189', '5435', 'y', '8931', '8987', 'F', '8377', 'k', '8631', '8717', 'q', '2923', 'g', '7225', 'j']
Example Output: 65415

Example Input: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']
Example Output: 12538

Example Input: ['565', 'm', '9889', '3425', 'H', '8977', '911', 'v', 'z', 'j', 'h']
Example Output:
23767