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.
['5093', 'H', 'T', 'L', 'g', 'd', 'E', 'z', 'f', 'N', 'p', 's', 'e', 'E', 'f', 'z', 'E', '7939', 'Y', 'E']