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.
['3985', 'M', 'z', 'x', 'h', '2967', '7089', '4549', 'G', '3051', '6273', '1639', 'v', '1183', 'H', '4303', '9231', 'v', '8797']