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:
['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']
answer:
26755


question:
['q', '5151', 'R', '441']
answer:
5592


question:
['973', 'v', 'I', '2683', 'U', 'Q', 'L', 'c', 'y', 'S', 'A', '9139', 'B', 'k', 'h', '3621']
answer:

16416