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.
['7535', 'B', '681', '9601', '9185', '8545', 'd', '951', 'v', 'i', '8223', 'E', '9185', '9343', 'x', '5725', '1235', '7673', '403']