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:
['187', 'J', 'l', 'p', '1009', 'g', '5817', 'V', 'B', 'Z', '3329', '9253']

Ex Output:
19595


Ex Input:
['D', 'm', 'P', '2433', '6731']

Ex Output:
9164


Ex Input:
['3943', 'b', '6873', '1491', '8325', '8457']

Ex Output:

29089