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:
['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
answer:
33888


question:
['83', 'k', 'p', 'o', 'b', '7819', '2089', '4141', 'c', 's', '6045', '6783', 'J', 'B', 'x', 'O', 'X', '9693']
answer:
36653


question:
['m', 'M', '17', 'M', 'K', 'x', 'c', 'x', 'r', '8287']
answer:

8304