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.
['5467', '3013', '8325', '4005', 'J', 'V', '395', '7477', 'E', 's', '1337', 'g', 'v', '8569', '9757', 'x', '3909', '2983', 's', '7917']