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:
['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']
answer:
24720


question:
['R', 'I', 'f', 'K', 'p', '8579', 'e', '1223', 'I', 'K', '8311', '2147', '4241', 'z', '6671', 'r']
answer:
31172


question:
['3083', '3949', '8731', '9631', 'O', '7703', '1693', '5041', 'R', 's', '5619', '9899', 'Y', 'p', 'P', '3567', '8997', 'l', 'w']
answer:

67913