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:
['w', 'I', 't', '813', 'K', '5785']
answer:
6598


question:
['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
answer:
5636


question:
['3423', '8449', 's', 'k', '9943', 'N', 'o', 'O', '3879', 'q', 'Z', 'y', 'w', '4289']
answer:

29983