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:
['2087', '8171', 'c', 'd', 'a', '5621', 'n']

Ex Output:
15879


Ex Input:
['b', 'W', 'V', 'R', '3761', 'U', '4553', '1803', 'W', '7775', '1067', 'Y', 'D', '3159']

Ex Output:
22118


Ex Input:
['1061', '2671', 'v']

Ex Output:

3732