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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']
Example Output: 15614

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

Example Input: ['7757', '2901', 'D', '251', '9669', '5477', 'y']
Example Output:
26055