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:
['2151', '7511']

Ex Output:
9662


Ex Input:
['V', '8137', 'b', 'k', '2081', 'L', '9733', '7525', 'D', '2381', 'O']

Ex Output:
29857


Ex Input:
['6711', '1863', '6741', '2911', '9499', '5563', 'f', 'i']

Ex Output:

33288