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: ['6217', 'A', '1925', 'o', '1433']
Example Output: 9575

Example Input: ['V', '8137', 'b', 'k', '2081', 'L', '9733', '7525', 'D', '2381', 'O']
Example Output: 29857

Example Input: ['A', 'c', '2103', 'i', 'A', '6749', 'p', 's', 'Q', 'G', 'O', '7211', 'C', '361', 's', 'g', '5929']
Example Output:
22353