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:
['c', '4501', 'O']

Ex Output:
4501


Ex Input:
['z', 'c', 'E', 'Q', '1839', 'g', 'X', 'c', '291', 'c', 'w', 'e', '5957', 'X', '6471', 'A', '8359', 'y', '3611', '5417']

Ex Output:
31945


Ex Input:
['V', 'T', '961', 'd', 'g', '8353', 'M', 'v', 'B', 'o', '1789', 's', 'i', 'Y', '9749', '3833', '1067']

Ex Output:

25752