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:
['7771', 'g']

Ex Output:
7771


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

Ex Output:
12030


Ex Input:
['1869', 'q', '5919', 'D', '7733', '2641', 'h', '1327']

Ex Output:

19489