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: ['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']
Example Output: 11769

Example Input: ['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
Example Output: 8317

Example Input: ['X', '73', '4811', '9981', 'i', 'J', 'w', 'I']
Example Output:
14865