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:
['1305', '1673', 'w']
answer:
2978


question:
['2559', 'c', '8341', 'R', 'n', '2703', 'A', 'S', 'C', 'J', '4167', 'I', '8717', '7257', '7805', '2943']
answer:

44492