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 black and brown dog is running out of the surf.
Hypothesis: A dog is swimming excitedly.
Update: The dog swims with great enthusiasm out of the water.
Example Output: strengthener

Example Input: Premise: A bearded man plays an instrument in front of a stone wall.
Hypothesis: The instrument is a tuba.
Update: The instrument is large and made of brass.
Example Output: strengthener

Example Input: Premise: A woman in a white coat speaks to a woman in a green coat while waiting for a train.
Hypothesis: Two lady's talk about their destination on a train.
Update: One woman is holding a religious tract up.
Example Output:
weakener