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:
['k', 'a']

Ex Output:
0


Ex Input:
['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Ex Output:
35458


Ex Input:
['H', 'J', 'Q', 'v', '5387', '6081', '6647', 'F', 'M', 'V', '1405', 'x', 'y']

Ex Output:

19520