Given a premise and two alternatives, choose the alternative that is a more plausible 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.

The balloon expanded.
(1)I blew into it.(2)I pricked it.
1

The child complained that he had to go to the bathroom.
(1)His father gave him a soda to drink.(2)His father stopped the car at a gas station.
2

Books fell out of the bookcase.
(1)The shelves were covered with dust.(2)An earthquake shook the bookcase.

2