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: ['x', '5259', 'T', 'L', 'C', 'H', '2493', 'u', '3851', '2439', 'U']
Example Output: 14042

Example Input: ['A', '9785', '1739', 'x', '2389', 'O', 'J', '1407', '9067', 'x', '9747', '2485', '4631', '6021', '4077', '2779', 'V', '2449', '7401']
Example Output: 63977

Example Input: ['7025', '1159', '6465', '6957', '93', '381', 'W', 'w', 'c', 'I', '2241', '821', '3729', 'o']
Example Output:
28871