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', 'f', 'p', 'R', 'N']
answer:
0


question:
['D', '1611', 'w', '8825', '8987', '3021', '9019', 's', '87', '9283', '5717', 'f', '1503', '6593', '8533', '785', 'g']
answer:
63964


question:
['149', '4673', '2919', '155', 't', '5085', '2191', 'B', '8369', 'r', '1645', '9429']
answer:

34615