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.
['9191', '9031', '765', '4599', '1029', 'h', 'F', '2631', '4731', 'g', '6403', 'f', 'm', '1957', 'J', 'v', '8245', 'u', '2363']