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.
['465', '5925', 'N', '7775', '3527', '739', 'x', '1197', '2391', '1513', '3085', 'y', '7163', 'O', '6199', 'm', 'v', 'h', 'O']