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:
['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']

Ex Output:
19001


Ex Input:
['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']

Ex Output:
20876


Ex Input:
['x', 'b', '8411', '5291']

Ex Output:

13702