【例2.2】你好世界
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
说明
输出中文短句"你好，世界。"
输入格式
无
输出格式
你好，世界。
样例
无你好，世界。
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
输出中文短句"你好，世界。"
无
你好，世界。
无你好，世界。