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', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']
answer:
32421


question:
['8529', '2657', '1599', 'b', '8187', '7005', '7481']
answer:
35458


question:
['N', 'e', '4267', 'E', 'X', '4915', '5955', 'S', 'f', 'L', '7909', '8015']
answer:

31061