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.
['z', '6885', '6095', 'V', '3713', '7569', 'E', '5217', '9379', 'S', '1241', '1073', 'h', 'V', 'q', '6805', 'z', 'w', 'S']