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:
['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']

Ex Output:
22172


Ex Input:
['3883', 'T', '6175', 'B', '4365', '3719', 'V', 'B', '3173', 'K', 'Z']

Ex Output:
21315


Ex Input:
['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']

Ex Output:

20876