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', 'G', '5059', '8343', '8673', 'P', 'N', '5485', '2279', '6121', 'i', 'U', '7277', '8701', 'A', 'b', 'Z', 'R', '6371', 'G']
answer:
58309

question:
['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']
answer:
33794

question:
['i', '1825', 'a', 'B', '2701', 'k', '389', '8651', '6075']
answer:
19641