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:
['q', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']
answer:
14871


question:
['P', '6161', 'k', '5925', 'h', 'G', 'n']
answer:
12086


question:
['9877', 'F']
answer:

9877