Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Example Input: Topic: Carbon emissions trading
 Argument: US cap-and-trade in sulfur dioxidew was succesful.
Example Output: in favor

Example Input: Topic: Cellulosic ethanol
 Argument: Cellulosic ethanol can generate good-paying jobs.
Example Output: in favor

Example Input: Topic: Gay marriage
 Argument: Acceptance of gay marriage should not be imposed on citizens.
Example Output:
against