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.
['8389', 'v', 'M', 'S', '5683', '8323', '2653', '8235', '3089', '341', '6545', 'R', '1997', '2287', 'i', 'h', 'I', 'q']