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.

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.
strengthener

Premise: Several people with their arms around one another at a celebration.
Hypothesis: A bunch of people celebrating
Update: They are wearing security uniforms and are standing in front of the stage.
weakener

Premise: Young man sitting at a fountain on the phone.
Hypothesis: The boy is using his phone.
Update: The boy is moving his lips.

strengthener