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: ['29', 'N', '5061', '7191', 'z', '8367']
Example Output: 20648

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

Example Input: ['b', '8327']
Example Output:
8327