instruction:
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.
question:
['6255', '8457', 'V', 'z', '4405', 'X', '9267', '5329', 'I']
answer:
33713


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


question:
['601', '4679', '183', 'A', 'H', 'N', '729', '9137', '8859', 'i', '7487', '6541', 'W', '1873', 'l']
answer:

40089