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 surfer rides his surfboard at the start of a wave.
Hypothesis: There are several people surfing on big waves.
Update: The surfer worries that nobody will see him fall.
Example Output: weakener

Example Input: Premise: Three people in white clothes observe graffiti on the side of a building.
Hypothesis: The people in white are going to paint over the graffiti.
Update: the people take out cameras and take photos
Example Output: weakener

Example Input: Premise: A man looking at chinese writing.
Hypothesis: An old man is appreciating the beauty of chinese calligraphy.
Update: The man is considered one of the leading experts in this field
Example Output:
strengthener