说明：  再次给出任意一个年月日（年>1900），现在我们不能只是直接计算，要先判断给出的日期是否合法，对于非法的日期要给出错误提示信息，合法的日期要再计算是星期几。
(Give any date (year > 1900) again. Now we can't just calculate directly. We should first judge whether the date given is legal. For illegal dates, we should give wrong information, and the legal date should be counted on Wednesday.)