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:
['3145', 'C', '7725', 'k', 'z']
answer:
10870


question:
['A', '9979', '8723', '1131', 'i', 'p', 'M']
answer:
19833


question:
['n', '1529', 'X', '6989', '2069', 'I']
answer:

10587