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.
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Question: Premise: Two guys hold up a flag at a festival.
Hypothesis: Two guys that are brothers are at a festival.
Update: One of the guys is black and one of the guys is white.

Answer: weakener


Question: Premise: Firefighters climbing past a tree.
Hypothesis: Firefighters are climbing to put out a fire on a tall building
Update: The firefighters are going up an extended ladder.

Answer: strengthener


Question: Premise: A sailboat in the water.
Hypothesis: A sailboat in the water on a hot summer day.
Update: The sky is blue and sunny.

Answer:
strengthener