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.
['y', '7665', '3627', '8161', 'V', '5939', 'E', 'S', '1165', 'g', '4855', '7435', '3065', '6353', '1859', '6925', 'Y', '6155']