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', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']
Example Output: 14871

Example Input: ['l', 'B', 'Y', '7543', '5091', '1917']
Example Output: 14551

Example Input: ['557', 'Q', 'A', 'b', 'r', 'f', '8237', '7759', '3671', '5013', 'b', 'm', '1245', '5069']
Example Output:
31551