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:
['x', '9895', 'r', 'H', 'C']
answer:
9895

question:
['3629', '8785', '9537', '8479', '3523', 'c', 'C', '5093', '2405', 'y', '1145', '8987', 'f']
answer:
51583

question:
['7111', '7139', 'N', 'Y', '2229', 'b', 'S', '2925', '7117', '4741', '4941', '3033', 'R', 'u', 'i', '5551', 'j', '5899', 'l']
answer:
50686