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:
['E', 'y']

Ex Output:
0


Ex Input:
['9905', 'm', 'Q', 'S', 'T', '7821', '1773', '9515', '3963', '2931', '7023', '8677', '1739', 'O', '909', '9153', '8319', 'k', '2851']

Ex Output:
74579


Ex Input:
['K', '3919', 'X', 'C', 'x', 'a', 'x', 'd', '581']

Ex Output:

4500