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: ['5467', '3013', '8325', '4005', 'J', 'V', '395', '7477', 'E', 's', '1337', 'g', 'v', '8569', '9757', 'x', '3909', '2983', 's', '7917']
Example Output: 63154

Example Input: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']
Example Output: 41628

Example Input: ['9539', 'K', 'M', 'c', '5759', '2483', '8789', '83', '147', '6413', 'a', '8779', 'Y', '2899', 'I', '3281', 'n']
Example Output:
48172