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', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']
Example Output: 13717

Example Input: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']
Example Output: 35458

Example Input: ['8901', 'E']
Example Output:
8901