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: ['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']
Example Output: 20070

Example Input: ['4089', '2385', 'E', 'K', '259', '295', '6649', '8645', 'n', '2577', '2683', '9041', 'Q', 'm', '4237']
Example Output: 40860

Example Input: ['V', 'G', 'A', '315', 'C', '4719', '9275', 'L', '7259', '631', '9671', '1631', '3241', '3985']
Example Output:
40727