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: ['S', 'D', '3101', '4967', '8197', '5025', '4257', 'S', 'X', '7641', 'n', '6775', '4719', 'o', '2821', 'x', '5605', '2181']
Example Output: 55289

Example Input: ['9365', '2347', '1251', 'l', 'F', '1375', 'd', '4187', '5149', 'x', '5051', 'e', 'D', 'f', '7977', 'H']
Example Output:
36702