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:
['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']

Ex Output:
39304


Ex Input:
['J', '9201', '4541', 'j', 'g', 's', 'E', '7771', 'u', 'M']

Ex Output:

21513