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: ['V', 'O', '1309', 'm', '9333', '8283', 'Z', 'K', 'X', 'w', '9855', '9075', '2013', '8485', '9973', '8779']
Example Output: 67105

Example Input: ['6833', 'R', '7323', 'd', '3487', '8777', '9053', 'y', 'i', 'O', '467', 'b', '5969', 'D', 'B', 'r', '3073', 'i', 't', 'd']
Example Output: 44982

Example Input: ['b', 'w', '6997', '3137']
Example Output:
10134