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: ['W', '3629', '6053', '1035', '1717', 'n', 'y', '9585', 'D', '5125', 's', '9801', '2905', 'E', '5797', 'T']
Example Output: 45647

Example Input: ['9509', 'o', 'l', '9873', 'h', 'N', '2059', '8595', 'D', 'L', '5913', 'o', '1443', 'C', 'y', 'K', 'J', 'a', 'X', 'E']
Example Output: 37392

Example Input: ['8481', '4635', 'z', 'v', 'G', '3199', 'k', 'H', 'U', 'H', 'K', 'H', '7483', 'O', '3399']
Example Output:
27197