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: ['8207', '4791', '3925', 'b', 'Z', '8471', '9215', '3117', 'p', '9095', 'h', 'k', 'E', 'h', '6047']
Example Output: 52868

Example Input: ['t', 'x', '5629', 'k', '2003', 'v', '541', 'l', 'v', '7983', '677', '6173', 'z', 'J', 's', 'u', '2187', 'Y']
Example Output: 25193

Example Input: ['4687', '7579', 'o', '7189', '9045', '1237', '1789', 'T', 'R', 'x', '255', 'N']
Example Output:
31781