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.
['2323', '8663', 'H', '2445', '2043', '3105', '2261', '3573', '4021', 'b', 'c', 'f', 'v', '8743', '6647', '3601', 'S', 'p']