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.

['2175', '4539', 'L', 'T', 'q', '2407', 'F', 'V', 'b', '9475', '2279', '4469', '6231']
31575

['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']
39416

['9395', 's', '3357', '3619', 'n', 'm', 'Y', '3591', '8069', '7469', '5173', '2805']

43478