TASK DEFINITION: Read the given query and classify it as a 'Good' or 'Bad' query depending on how well the query is formed, 'Bad' being the expected output for a not so well formed query and 'Good' being the expected output for a well formed query. A query may be wrong based on common sense or general facts, but if it is well formed, you should answer with Good.
PROBLEM: How can you draw on a mac ?

SOLUTION: Good

PROBLEM: What is value of 1918 liberty half dollar ?

SOLUTION: Bad

PROBLEM: When were slate roofs invented ?

SOLUTION:
Good