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:
['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']
answer:
61496


question:
['8109', '5635', 'u', 'M', '1009']
answer:
14753


question:
['Q', 'j', 'B', 'J', 'N', 'e', '2637', 'b', '7247', 'L', '9507', '5209', 't', 'W', '4263']
answer:

28863