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:
['i', 'w', '8117', '2823', 'C', 'x', 'w', '5959', 'g', 'e', 'L', 'V', 'i', 'w', 'n']

Ex Output:
16899


Ex Input:
['7763', '6003', 'V']

Ex Output:
13766


Ex Input:
['B', 'X', '9689', 'o']

Ex Output:

9689