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


question:
['R', 'C', 'S', 'x', '1529', 'r']
answer:
1529


question:
['7913', '4149', 'K', 'Y', '1085', '1487', 'H', '9803', 'x', '1881', 'J', '6291', 'd', 'K', 'o', '8079', '613', '1889']
answer:

43190