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: ['5095', '8235', '4901', 's', '4177', '3077', 'l']
Example Output: 25485

Example Input: ['5899', '229', 'm', '3347', 'k', 'q', 'g', '2755', '8727', '2035', '823', '6835', '9271', 'Q']
Example Output: 39921

Example Input: ['3323', '6231', 'a', '5309', 'h', 'K', '9589', '5939']
Example Output:
30391