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: ['9069', '8333', 'H', '2049', '8051', 'L', '2749', '8819', '2883', '9317', 'M', '6515']
Example Output: 57785

Example Input: ['b', 'O', '7023', 'q', '2667', '681', 'C', '5707', '7125', 'q', 'Q', '1375', '8869', '6709']
Example Output: 40156

Example Input: ['6439', '2637', 'g', 'q', 'S', '6121', 'i', 'x', 'O', 'd', '6835', '9209', 'Q', 'p', 'I', '4559', '2215', '7407', 'g']
Example Output:
45422