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:
['l', 'V']
answer:
0


question:
['J', 'r', 'S', '3891']
answer:

3891