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.
['3203', 'n', '5351', '8285', 'e', 'F', 'A', 'N', '6385', 'e', '2139', 'h', 'H', 'T', 'x', 'E', '1103']