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: ['4607', 'T', 'a', '6077', 'c', '4761']
Example Output: 15445

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

Example Input: ['v', '3135', 'J', 'm', 'a']
Example Output:
3135