曾经，有一个题面摆在 ydc 的面前没有珍惜，直到失去时才后悔莫及，
如果上天再给他一次机会，ydc 一定会牢牢的记住这个题面。
没办法，已经失去了，所以这道题只能让你帮 ydc 做了。
已知的信息只有，这道题是传统题，采用全文比较的方式，时间限制 $1\texttt{s}$，空间限制 $256\texttt{MB}$。
ydc 还给你提供了这道题的所有数据（见下发文件）。
该题在比赛时显示的成绩就是最终成绩。
来源
中国国家集训队互测2015 - By 于纪平
QOJ.ac
QOJ
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Time Limit:
1 s
Memory Limit:
256 MB
Total points:
100
#4265. ydc的题面
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