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: A little blond girl sitting on the floor looks up.
Hypothesis: The little girl looks up at her father.
Update: A person hands her lollipop.
Example Output: strengthener

Example Input: Premise: A flying machine with a yellow sail is landing with industrial buildings in the background.
Hypothesis: The machine is not gas-operated.
Update: The machine has a battery.
Example Output: strengthener

Example Input: Premise: Large brown dog jumps over a low tree trunk in a wooded area.
Hypothesis: A dog jumps over a tree trunk while being chased by a bear.
Update: The dog has a bloody leg
Example Output:
strengthener