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: ['3051', '5343', 'k', 'k', '6815', 'E', '4745', 'A', 'A', '1251', '6649', 'f', '4133', 'X']
Example Output: 31987

Example Input: ['A', '9785', '1739', 'x', '2389', 'O', 'J', '1407', '9067', 'x', '9747', '2485', '4631', '6021', '4077', '2779', 'V', '2449', '7401']
Example Output: 63977

Example Input: ['2327', 'm', '4843', 'B', '8107', '99', '517', '6989', '3971', 'C', 'k', 'Z', '2313', '5653', '4103']
Example Output:
38922