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: ['i', 'w', '8117', '2823', 'C', 'x', 'w', '5959', 'g', 'e', 'L', 'V', 'i', 'w', 'n']
Example Output: 16899

Example Input: ['2691', '3861', '7087', '4661', '6527']
Example Output: 24827

Example Input: ['F', '403', '5961', 'o', 'M', '6373', '325', 'H', 'v']
Example Output:
13062