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:
['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']

Ex Output:
12030


Ex Input:
['g', '5301']

Ex Output:
5301


Ex Input:
['Z', 'c', '2139', '6779']

Ex Output:

8918