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: Two dogs on leashes straining toward each other while their owners walk away from each other.
Hypothesis: The dogs hate eachother.
Update: The two male dogs are very aggressive towards each other.
Example Output: strengthener

Example Input: Premise: A person in black glasses takes a drink from a shot glass.
Hypothesis: A person drinks whiskey in the early evening after a day of hard work.
Update: the man asks for another the bartender grabs a bottle of whiskey while the man puts his briefcase down
Example Output: strengthener

Example Input: Premise: A man in a Hawaiian print shirt playing a guitar and singing.
Hypothesis: A man is playing an instrument by the beach.
Update: A man plays an instrument while sitting inside a lounge.
Example Output:
weakener