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 man in a blue shirt is pushing another man in a white shirt during football practice.
Hypothesis: The offensive man is blocking the defense.
Update: The offensive man is blocking the exit from the football field.
Example Output: weakener

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: Someone with a colorful board is wind-surfing on a cloudy day.
Hypothesis: A girl is windsurfing.
Update: The person on the board has a long white beard.
Example Output:
weakener