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.

['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']
42665

['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']
67939

['8249', '7009', '7749', '2169', '2361', 'R', '1187', '6497', 'm', 'R', 'U', 'M', 'a', 'P', 'H', 'W', 'd']

35221