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 child is window shopping for a brown purse.
Hypothesis: A child is shopping to complete their outfit
Update: Tomorrow is her mother's birthday.
Example Output: weakener

Example Input: Premise: A man in white on the phone and a man in black sitting back to back in white chairs.
Hypothesis: two people are relaxing in chairs.
Update: The men are listening to soft classical music.
Example Output:
strengthener