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.
['3353', 'B', '941', 'Z', 'C', '3041', '3463', 'e', '4251', '4293', '6165', 'W', 'u', 's', 'a', '6657', '2685', '9637', 'V']