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:
['B', 's']

Ex Output:
0


Ex Input:
['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']

Ex Output:
3566


Ex Input:
['W', 'm', '2193', 'g']

Ex Output:

2193