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:
['W', 'H', 'k', 'L', '2425']
answer:
2425


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


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

45451