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.

Example Input: Premise: Woman and young lady sit on the sidewalk while young man plays flute in background.
Hypothesis: The man is secretly a Russian spy watching the womens' every move.
Update: He surreptitiously snaps a photo.
Example Output: strengthener

Example Input: Premise: A person is riding a red motorcycle around a track.
Hypothesis: people are racing dirt bikes
Update: The person is being filmed by news cameras
Example Output: strengthener

Example Input: Premise: Female basketball players warming up before a game.
Hypothesis: The women here play for Duke University.
Update: The players' jerseys all say 'Blue Devils'
Example Output:
strengthener