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: ['2485', 'Q', 'G', '5533', 'Y', '21', 'D', 'S']
Example Output: 8039

Example Input: ['6019', '1467', '3415', '7785']
Example Output: 18686

Example Input: ['8343', 'L', '2931', '6585', 'i', 'b', 'c', '2395', 'D', '9215', 'c', '3533', 'Y', '1475', 'A', 'b', 'g', '3083']
Example Output:
37560