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: An icy, snowy city street with a bike resting against a pole.
Hypothesis: The bike is covered in snow.
Update: There are fresh tire track behind the bike.
[A]: weakener


[Q]: Premise: The sky appears clear.
Hypothesis: The sky looked very clear at night.
Update: Many stars are visible.
[A]: strengthener


[Q]: Premise: People are riding in a red sightseeing bus.
Hypothesis: The bus is showing them the sites of London.
Update: The bus stops in front of Big Ben.
[A]:
strengthener