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.
['333', 'f', 'x', '8447', 'E', '8029', 'I', 'a', 'm', '47', '7265', 'h', 's', 'V', '5603', '7389', '2207', '8195', '1895', '7691']