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:
['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']
answer:
42641


question:
['4975', 'M', 'C', 'D', 't', 'i', 't', 'L']
answer:
4975


question:
['y', '3281', '6299', '3707', '5189']
answer:

18476