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.

['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']
26596

['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']
20876

['x', '9565', '5935']

15500