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:
['1867', '5301', 'x', '3867', '8707', '2429', 'K', '59', '6629', 'v', 'A', 'y', 'P', '3829', '1979', 'R', '8481', '5767', 'h', 'U']
answer:
48915


question:
['k', 't', '8531', 'm', 'd', '3181', 'P', 'U', 'j', '2081', '29', '1243', '3675']
answer:

18740