Each input row can only generate one row of output data.
每个输入行只能生成一行输出数据。
There is one rule for each input and for each state.
有一个规则，每个输入端和每个国家。
Each call to the function should return one line of input as a string.
该函数的每次调用都应该返回输出的其中一行作为字符串。
Each line of input will result in exactly one line of output.
对于每一行输入，恰好用一行输出。
There should be one output line for each input line.
每行输入对应一行输出。
There should be one output line for each input line.
每行输入对应一行输出。
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