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.
['7009', 'S', 'z', 'Z', '745', '9667', 'A', '2585', '9399', '1271', '5249', '3699', 'N', 'H', '9737', 'e', 'G', 'Q']