시간 제한 메모리 제한 제출 정답 맞은 사람 정답 비율
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문제

상근이는 세계적인 소프트웨어 회사 기글에서 일한다. 이 회사의 가장 큰 특징은 자유로운 출퇴근 시간이다. 따라서, 직원들은 반드시 9시부터 6시까지 회사에 있지 않아도 된다.

각 직원은 자기가 원할 때 출근할 수 있고, 아무때나 퇴근할 수 있다.

상근이는 모든 사람의 출입카드 시스템의 로그를 가지고 있다. 이 로그는 어떤 사람이 회사에 들어왔는지, 나갔는지가 기록되어져 있다. 로그가 주어졌을 때, 현재 회사에 있는 모든 사람을 구하는 프로그램을 작성하시오.

입력

첫째 줄에 로그에 기록된 출입 기록의 수 n이 주어진다. (2 ≤ n ≤ 106) 다음 n개의 줄에는 출입 기록이 순서대로 주어지며, 각 사람의 이름이 주어지고 "enter"나 "leave"가 주어진다. "enter"인 경우는 출근, "leave"인 경우는 퇴근이다.

회사에는 동명이인이 없으며, 대소문자가 다른 경우에는 다른 이름이다. 사람들의 이름은 알파벳 대소문자로 구성된 5글자 이하의 문자열이다.

출력

현재 회사에 있는 사람의 이름을 사전 순의 역순으로 한 줄에 한 명씩 출력한다.

예제 입력 1

4
Baha enter
Askar enter
Baha leave
Artem enter

예제 출력 1

Askar
Artem
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

출처

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