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: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']
Example Output: 6713

Example Input: ['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']
Example Output: 33416

Example Input: ['h', '8469', 'q', 'F', '469', '4963', '6877', 'n', '3119', '5923', '7301', 'm', 'C', '8447', 'c', 'L', '9167', 'X', '4409', 'T']
Example Output:
59144