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:
['Z', '4157', '5185', 'U', 'i', '1115', 'A', '7427', '3313', 'S']
answer:
21197


question:
['2713', 'G', 'm']
answer:

2713