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: ['6165', 'x', 'u', 'n', 'V', 'B', '4039', 'l', '991', 'x', '335', '9011', 'K', '8725', 'a', '6291', 'j']
Example Output: 35557

Example Input: ['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']
Example Output: 32299

Example Input: ['2501', 'r', '5965', '3807', '6625', 'v', 'A', 'Z', 's', '7293', 'K', 'L', '2593', '2073', '3003']
Example Output:
33860