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.
['8027', '2177', 's', '3693', 'w', '1447', '4653', '2737', 'm', 'K', '4401', '4543', '7099', 'u', '4841', 'p', 'J', 'x', 'h']