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:
['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

Ex Output:
6713


Ex Input:
['4701', 'b', 'i', 'B', 'z', '7837', 'W']

Ex Output:
12538


Ex Input:
['9337', '9753', '2405', 'W', 'g', '1485', 'g', '161', '2593', '7137']

Ex Output:

32871