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.
['8349', 'Q', 'B', 'E', 'S', '2469', '4765', 'D', 'J', '6569', 'k', '2087', '1243', 'q', '3119', 'X', '5049', 'm', 'h']