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 boy in the woods.
Hypothesis: There is a boy headed to the woods.
Update: A police dispatcher says 'I see the guy walking towards the dark trees area'
Example Output: strengthener

Example Input: Premise: A slender man, shirtless with tattoos, carries his skateboard while making a displeased face.
Hypothesis: A shirtless man with a skateboard is unhappy that he didn't win a contest
Update: The man just checked his bank account balance and found it was overdrawn.
Example Output: weakener

Example Input: Premise: Two runners with marathon tags wearing black shirts.
Hypothesis: The runners are running a 5k for their friend with cancer.
Update: The black shirts have ribbons on them
Example Output:
strengthener