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.
['d', '1753', 'k', '8203', 'H', '7335', '4855', '3511', 'E', 'd', 'Y', '5429', 'm', '5681', 'E', '2307', 'S', 'g']