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:
['o', 'a', 'K', '6031']
answer:
6031


question:
['g', 'A', 'm', '4005', '8079', 'G']
answer:
12084


question:
['6459', '3689', 'a', 'l', 'z', 'i', 'G', 'U', 'O', '3977', 'A', 'g', '3331']
answer:

17456