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.
['2185', '4961', '9279', 't', 'V', 'z', '3071', 'i', '6497', 'b', '5579', 'Z', '5087', 'a', 'G', 'r', 'h', '1313']