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.
['N', 'z', 'O', '6567', 'F', 'E', 'u', 'Z', '7949', 'V', 'M', 'q', '7565', '951', 'E', '2637', 'Z', 'h']