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', 'E', 'M', '1303', 'y', 'H']
Example Output: 1303

Example Input: ['8683', 'p', '47', '8983', 'g', 'u']
Example Output: 17713

Example Input: ['K', 'O', 'p', '1669', '8647', '3417', 'a', '8903', 'V', 'E', 'l', 'a', '5177', 'J', '6559', '5377', 'X', '9427']
Example Output:
49176