In this task you are given a premise and two alternatives in Chinese. You must choose the alternative that is more plausibly the cause or effect of the situation described by the premise. The input format is "premise
(1)alternative_1(2)alternative_2", the output should either be "1" or "2" based on your judgment.

树枝落在河里。
(1)树枝向下游移动。(2)这条河的水流变强了。
1

房子里的电停了。
(1)我找了手电筒。(2)我拿起一把铲子。
1

我看电影屏幕的视线被挡住了。
(1)我身后的情侣在窃窃私语。(2)一个高个子的人坐在我面前。

2