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


question:
['507', 'P', '9697', 'u', '5057']
answer:
15261


question:
['g', '2489', '9141', 'J', '6763', '1893', 'U', 'G']
answer:

20286