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:
['s', 'g', 'Z', '8919', 'R']
answer:
8919


question:
['k', 'a']
answer:
0


question:
['3317', 'N', 'P', '8861', '165', 'P', 'v']
answer:

12343