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.

Ex Input:
['3839', 'D', '4741', 'L']

Ex Output:
8580


Ex Input:
['5095', '8235', '4901', 's', '4177', '3077', 'l']

Ex Output:
25485


Ex Input:
['w', 'l', '4797', 'E', '5643', 'y', 'y', 'N', '1233', '9233']

Ex Output:

20906