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: Girl wearing a hat and holding her bike talks to her friend.
Hypothesis: Girl holding her bike is talking to her friend with black hair.
Update: The girl's hair is dark.
Example Output: strengthener

Example Input: Premise: A boy in a swimsuit walking in the sand towards the water
Hypothesis: A boy in a swimsuit happily walking
Update: The boy laughs as he walks along.
Example Output: strengthener

Example Input: Premise: A dark-haired girl in a large gray coat rides a tiny pink bicycle through a green, grassy park.
Hypothesis: A girl rides her bicycle through  a grassy park in spring.
Update: She observes the newly bloomed flowers and the first leaves on the trees.
Example Output:
strengthener