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: ['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']
Example Output: 33575

Example Input: ['8207', '4791', '3925', 'b', 'Z', '8471', '9215', '3117', 'p', '9095', 'h', 'k', 'E', 'h', '6047']
Example Output: 52868

Example Input: ['9863', 'y']
Example Output:
9863