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

Example Input: ['9403', 'u', '4159', 'w', '3467']
Example Output: 17029

Example Input: ['6533', '6133']
Example Output:
12666