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:
['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']

Ex Output:
24879


Ex Input:
['7755', '8383', 'y', 'k', '4869', '2809']

Ex Output:
23816


Ex Input:
['2879', '8971', 'Z', '3687', 'J', 'C']

Ex Output:

15537