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:
['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']
answer:
12030


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


question:
['791', '1091', '925', 'L', 'M', '4679', '6377']
answer:

13863