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:
['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']

Ex Output:
15421


Ex Input:
['F', 'z', '1159', '345']

Ex Output:
1504


Ex Input:
['2707', '5927', 'z', 'k', 'z', '3379', '5071', 'h', '7155', '9435', 'x', '8731']

Ex Output:

42405