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:
['Y', '8169', '9067']

Ex Output:
17236


Ex Input:
['3051', '5343', 'k', 'k', '6815', 'E', '4745', 'A', 'A', '1251', '6649', 'f', '4133', 'X']

Ex Output:
31987


Ex Input:
['2817', '4437', '3577', 's', 'D']

Ex Output:

10831