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: ['7361', '6913', '3605', '2081', '7619']
Example Output: 27579

Example Input: ['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']
Example Output: 42665

Example Input: ['c', 'J', 'Y', 'i', '8387', '2671', '3453', '9571', '9567', '6427', 'O', '771', '4211', 'b']
Example Output:
45058