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:
['k', 'a']
answer:
0


question:
['1709', 'S', 'w', '7725', 'Z', '7755', '8081', '897', 'N', '4449', 'F', 'F', 'M', 'y', 'B', 'h', 's', 'l', 's', '415']
answer:
31031


question:
['b', 'c', 'E', 'R', 'f', '4435', '193', 'i', '115']
answer:

4743