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: ['2895', '8095', 'y', '1927', '4827']
Example Output: 17744

Example Input: ['3839', 'D', '4741', 'L']
Example Output: 8580

Example Input: ['3995', 'S', 'M', '1799', 'X', 'T', '5599', '3417', '999', '2473', '5059', 'k', 'E', 'j', '9257']
Example Output:
32598