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:
['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
answer:
45451


question:
['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']
answer:
11769


question:
['1989', '8323', '881', '3521', 'I', 'Y', '9779', '3795', 'x', 'o', 'B', '3811', 'L', 'D', 'v', 's', 'V', '1557', 'Z', 'd']
answer:

33656