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.

['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
12302

['8109', '6811', 'f', 'l', '5869', 'm', '4657', 'y', 'P', '7983', 'o', 's', 'i', 'm', '2141', '4497']
40067

['6009', '6073', '3729', '8899', '1853', '4121', 'S', 's']

30684