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: ['6941', 'I', 'j', '6135', '6525', '7853', '5607']
Example Output: 33061

Example Input: ['x', '1305', 'b', '8193']
Example Output: 9498

Example Input: ['4569', 'q', 't', 'L', 'w', '47']
Example Output:
4616