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', 'J', 'n', '4473', 's', '8761', '8095', 'V', '4059', 'L', '837', '3743', '7739', '5153', '7217', '6955', 'C', 's', 'Q', 'V']