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.
['5465', 'd', 'l', 'z', 'N', '2005', '9103', 'E', 'U', '9607', '8395', '6283', 'w', 'D', '3903', '1175', '9083', '9351']