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: ['1869', 'q', '5919', 'D', '7733', '2641', 'h', '1327']
Example Output: 19489

Example Input: ['L', 'i', '9225', 'w', '5365', '8077', '2733', 'W', '8493', 'B']
Example Output: 33893

Example Input: ['5193', '7759', '7911', '6515', 'R', '8729', 't', '8323', 'A', 'I', '6747', '6871', 'A', 'h', 'f', '7281', '461', 'z', 'L']
Example Output:
65790