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: Two people on bicycles, one is wearing white and black and the other is wearing blue and red.
Hypothesis: Two bicycle riders are racing.
Update: They wear racing bibs with different numbers.
Example Output: strengthener

Example Input: Premise: A woman stands in front of a man holding a small, smiling baby.
Hypothesis: A mother standing with her husband look at their baby.
Update: The man kisses the woman as they gaze at the baby.
Example Output: strengthener

Example Input: Premise: three musicians standing on a stage, one is playing an instrument with a keyboard and the other two are singing into microphones.
Hypothesis: The musicians are playing piano driven music.
Update: The keyboard only plays a short time.
Example Output:
weakener