Preparing NOJ

Chat Order

3000ms 262144K

Description:

Polycarp is a big lover of killing time in social networks. A page with a chatlist in his favourite network is made so that when a message is sent to some friend, his friend's chat rises to the very top of the page. The relative order of the other chats doesn't change. If there was no chat with this friend before, then a new chat is simply inserted to the top of the list.

Assuming that the chat list is initially empty, given the sequence of Polycaprus' messages make a list of chats after all of his messages are processed. Assume that no friend wrote any message to Polycarpus.

Input:

The first line contains integer n (1 ≤ n ≤ 200 000) — the number of Polycarpus' messages. Next n lines enlist the message recipients in the order in which the messages were sent. The name of each participant is a non-empty sequence of lowercase English letters of length at most 10.

Output:

Print all the recipients to who Polycarp talked to in the order of chats with them, from top to bottom.

Sample Input:

4
alex
ivan
roman
ivan

Sample Output:

ivan
roman
alex

Sample Input:

8
alina
maria
ekaterina
darya
darya
ekaterina
maria
alina

Sample Output:

alina
maria
ekaterina
darya

Note:

In the first test case Polycarpus first writes to friend by name "alex", and the list looks as follows:

  1. alex

Then Polycarpus writes to friend by name "ivan" and the list looks as follows:

  1. ivan
  2. alex

Polycarpus writes the third message to friend by name "roman" and the list looks as follows:

  1. roman
  2. ivan
  3. alex

Polycarpus writes the fourth message to friend by name "ivan", to who he has already sent a message, so the list of chats changes as follows:

  1. ivan
  2. roman
  3. alex

Info

CodeForces

Provider CodeForces

Origin VK Cup 2016 - Qualification Round 1

Code CF637B

Tags

binary searchdata structuressortings

Submitted 57

Passed 33

AC Rate 57.89%

Date 03/04/2019 15:10:21

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