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: ['x', 'V', 'g', '5469', 'c', '7873', 'T', 'p', '8109', '5395', 'h', 'z', 'T', '9373']
Example Output: 36219

Example Input: ['Y', '8169', '9067']
Example Output: 17236

Example Input: ['1121', '3391', '649', 'i']
Example Output:
5161