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.
['W', 'q', 'w', 'q', '8037', 'q', '6279', 'M', 'B', '9429', '1193', 'z', 'z', 'H', '6375', 'v', '9715', 'q']