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.
['s', '9097', 'E', 'u', '2633', 'a', 'k', '5445', 'W', '5347', 'J', 'H', '2139', 'J', 'm', '4829', 'Z', '1391']