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.

['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
33888

['3629', '8785', '9537', '8479', '3523', 'c', 'C', '5093', '2405', 'y', '1145', '8987', 'f']
51583

['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']

35388