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: ['1709', 'S', 'w', '7725', 'Z', '7755', '8081', '897', 'N', '4449', 'F', 'F', 'M', 'y', 'B', 'h', 's', 'l', 's', '415']
Example Output: 31031

Example Input: ['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']
Example Output: 15421

Example Input: ['1907', '9001', '2117', 'a', 'z', '5887', '7169', '809', 'N', 'T', '1541', 'Q', 'a', '371', 'T']
Example Output:
28802