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:
['Q', '1669']
answer:
1669


question:
['1057', '3937']
answer:
4994


question:
['1403', 'v', 'Q', 'l', '8893', '3403', '2151', 'W', 'n', 'H']
answer:

15850