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:
['5715', 'r', 'R']
answer:
5715


question:
['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
answer:
29604


question:
['2879', '4563', 'z', 'E', '3543']
answer:

10985