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

Ex Output:
20876


Ex Input:
['W', 'c', '7971', 'J', 'o']

Ex Output:
7971


Ex Input:
['c', '7763', 'o', 'M', 'u', '7821', 'm', 'E']

Ex Output:

15584