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: ['3319', 'e', 'c', 'G', '2399', '1557', '4813', 'z', 'U', '4895', 's', '1193', 'A', 'G']
Example Output: 18176

Example Input: ['p', 'V', '673', '8483', 'S']
Example Output: 9156

Example Input: ['N', 'J', '6603']
Example Output:
6603