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:
['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']

Ex Output:
23475


Ex Input:
['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']

Ex Output:
33575


Ex Input:
['X', 'V', 'T', 'x', '1321', '4237', 'd', 'I', '1721', '6035', 'W', '4043', 'O', 'W', '3109', 'M', 'E']

Ex Output:

20466