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: An older gentleman in a checkered shirt carrying milk jugs using a yoke.
Hypothesis: The man is going to get milk for his family by foot.
Update: The milk truck can be seen off in the distance.
Example Output: weakener

Example Input: Premise: A female doctor is talking to an elderly patient having tests run.
Hypothesis: A female doctor is running blood tests on the patient.
Update: The doctor is making sure the patient has no metal on them
Example Output: weakener

Example Input: Premise: Male tennis player with tattoo on left arm in position to hit the ball with onlooker sitting down.
Hypothesis: Male tennis player with tattoo on left are prepares to return a serve in a semi-final game with the already determined finalist sitting watching to see who they will play.
Update: The finalist watches the game intently.
Example Output:
strengthener