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: ['b', '5689', '119', 'p', 'P', 'J', 'w', 'm', '7397', 'Y', '447', 'O', 'p', '319', 'H', 'U']
Example Output: 13971

Example Input: ['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']
Example Output: 19393

Example Input: ['9395', 'b', 'i', 'b', 'E', '4417', 'L', '443', 'R', '1689', 'l', '5907', 'D']
Example Output:
21851