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.
['v', '6239', 'S', 'D', '7113', '9127', 'y', '6059', '4555', '2573', 'Q', 'E', 'E', 'U', '7153', '4953', '9171', '2309']