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: ['6293', 'o']
Example Output: 6293

Example Input: ['a', 'q', '4085', '6327', '6869', 'Z', 't', '7057', '1965', 'p', 'o']
Example Output: 26303

Example Input: ['2057', 'k', 'T', '1599', '4815', 'n', 'S', 'f', '8187', 'c', 'B']
Example Output:
16658