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:
['9403', 'u', '4159', 'w', '3467']
answer:
17029


question:
['2225', '1925']
answer:
4150


question:
['h', 'C', 'I', 'O', 'M', '4017', '1723', 'B']
answer:

5740