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: ['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
Example Output: 29604

Example Input: ['O', '6593', '31', '5921', '853', 's', 'x', 'i', '7221', 'r', 'x', 'Z', '5747', '3669', 'F', '1973', '963', 'G']
Example Output:
32971