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:
['q', '5151', 'R', '441']

Ex Output:
5592


Ex Input:
['4201', '6445', '4009', 'q']

Ex Output:
14655


Ex Input:
['h', '2257', 'U', '5275', '4143', '8831', '8379', '1729', '2287', 'a', 'h', '15']

Ex Output:

32916