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: ['Q', '8317', '8989']
Example Output: 17306

Example Input: ['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']
Example Output: 36242

Example Input: ['6523', 'R', '1633', '3079', 'U', 'Q', 'q']
Example Output:
11235