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.

Input: Consider Input: Premise: An icy, snowy city street with a bike resting against a pole.
Hypothesis: The bike is covered in snow.
Update: There are fresh tire track behind the bike.

Output: weakener


Input: Consider Input: Premise: A young girl is holding an end of the string of a yo-yo in one hand and the body of the pink yo-yo in the other.
Hypothesis: A girl is holding a yo-yo for her friend.
Update: The girl does tricks with the yo-yo.

Output: weakener


Input: Consider Input: Premise: Children are sitting at a long brown table in front of a bulletin board.
Hypothesis: The children sit in class.
Update: A teacher is in front of the children.


Output: strengthener