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:
['2729', 'W', 'i', '9073', '343', 'j', '2329', '9159', '4825']

Ex Output:
28458


Ex Input:
['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

Ex Output:
26299


Ex Input:
['7509', '3487', 'n', '225', 'W', 'J', '5425', '39']

Ex Output:

16685