In this task, you are given a premise, a hypothesis, and an update. The premise sentence describes a real-world situation and is always assumed to be true. The hypothesis sentence describes an assumption or inference that you might make about that situation having read the premise. The update provides additional information about the situation that might weaken or strengthen the hypothesis. A weakener is a statement that weakens the hypothesis, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.

Ex Input:
Premise: An enthusiastic young man runs with an exercise ball as he's being chased.
Hypothesis: A man and his friend is playing catch.
Update: The man throws the ball back to his friend.

Ex Output:
strengthener


Ex Input:
Premise: Five students are reading off a piece of paper.
Hypothesis: the students are practicing for  a test
Update: The paper is a note from another student.

Ex Output:
weakener


Ex Input:
Premise: Train station with construction going on.
Hypothesis: Workers at a train station.
Update: The workers have gone on strike, leaving the half-finished train station in disarray.

Ex Output:

weakener