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:
['n', '6729', 'p', 'D', 'o', '1213', 'e', '6951', '2341', '9997', 'e', 'M', 'x', 'R']
answer:
27231


question:
['6787', 'W', 'I', '4929', 'j', 'I', '3487', 'F', '3927', 'Q', 's', 'X', '9939', 'n']
answer:
29069


question:
['8031', '2113', 'e', '4757', 'P', 'I', 'z', 'u', '5691', 't', 'h', 'y', 'T']
answer:

20592