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:
['8739', 'K']
answer:
8739


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


question:
['1743', '2719', 'R', 'I', '5795', 'm']
answer:

10257