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.
['8559', '6023', 'T', '5213', 'h', '2259', 'n', '4019', '5363', 'c', 'd', '4147', '1615', 'I', '2275', 'q', 'L', 'p']