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: ['U', '5607', 'Q', 'j', 'I', '3745', '3031']
Example Output: 12383

Example Input: ['659', 'L', 'e', '1037', '8219', 'Q', '6881', 'W', '4547', '2033', 'h', '4845', 'Q', '8053', 'Q', 'a', '5485', '9373']
Example Output:
51132