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: A man dressed in black playing the trumpet.
Hypothesis: There is a man playing trumpet in a concert.
Update: The man is walking down the street.
Example Output: weakener

Example Input: Premise: A bunch of people standing on sand.
Hypothesis: people are standing on a beach.
Update: Everyone is standing barefoot on hot sand.
Example Output: strengthener

Example Input: Premise: One young girl with brown hair is smiling and talking to a young girl with blond-hair.
Hypothesis: The girls are sisters.
Update: Their mother likes to dress them in matching outfits.
Example Output:
strengthener