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.
['E', 'L', '1659', 'o', 'H', 'l', '9159', '1749', '7807', 'E', 'S', 'h', 'W', '8247', 'q', '2531', '9159', '3463', 'u', 'b']