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:
['5215', 'c', '839', 'V']

Ex Output:
6054


Ex Input:
['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']

Ex Output:
23009


Ex Input:
['U', 'd', '893', 'h', '9679', '315', 'H', '339', '2381', '847', '7951', 'e', '9269', '9081', 'o', '6439', 'N', '4531']

Ex Output:

51725