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.
['6123', 'X', '8475', '3151', 'p', '395', '385', 'A', '4249', 'l', '9515', 'e', '6667', '1369', 'V', '8037', '1397', '6343', 'x', '9009']