TASK DEFINITION: In this task your given two statements in Chinese. You must judge whether the second sentence is the cause or effect of the first one. Label the instances as "cause" or "effect" based on your judgment. The sentences are separated by a newline character.
PROBLEM: 男孩退缩了。
女孩戳了他。

SOLUTION: cause

PROBLEM: 垃圾袋装满了。
我把它带到垃圾箱里。

SOLUTION: effect

PROBLEM: 学生们离开了教室。
铃响了。

SOLUTION:
cause