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.

Q: Premise: Children climbing an old tree in front of a brick building.
Hypothesis: Children are climbing an old tree in front of the school.
Update: The library in the area has been around for many years.

A: strengthener
****
Q: Premise: A man is swinging on a rope above the water.
Hypothesis: A man pretends to be Tarzan as he swings around.
Update: The man holds the rope with two hands.

A: weakener
****
Q: Premise: A man in blue bravely cleans windows on a tall building during the day.
Hypothesis: A man is cleaning windows on a scorching hot day.
Update: The man arrived late to work and now has to work into the late afternoon.

A:
strengthener
****