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: ['l', 'V']
Example Output: 0

Example Input: ['3319', 'e', 'c', 'G', '2399', '1557', '4813', 'z', 'U', '4895', 's', '1193', 'A', 'G']
Example Output: 18176

Example Input: ['O', '3095', 't', 'k', '6215', '2349', 'e', '5243', '9681', 'E', '3707', 'v', 'O', '3901', '6453', '2979', '9947', 'z']
Example Output:
53570