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: ['Q', '8317', '8989']
Example Output: 17306

Example Input: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
Example Output: 5636

Example Input: ['T', 'S', 'm', '4237', '489', '5705', '4319', '2619', 'O', '8007']
Example Output:
25376