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:
['8821', '7221']
answer:
16042


question:
['4601', '6021', '3005', 'I', 'f', '4631', 'Q', 'd', '8041', 'D', '8067', '7383', '757', 't', 'd', 'n', '2275', 'p', 'm', '6021']
answer:
50802


question:
['8939', 'D', '5135', '7459', '4803', 'o', '6171', '8819', 'k']
answer:

41326