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:
['2871', '1337', '3771', '4671', 'l', '3785', 'V', 'z', 'R', 'u', '6097', 'R', '4297', 'd', '6339', 'Y', 'V', '5873', '7399']
answer:
46440


question:
['x', '1887', 'E', '3995', '5677', '2749', '9951']
answer:
24259


question:
['K', 'Y', 'R', 'Z']
answer:

0