====== 배부른 마라토너 ======

===== 풀이 =====
  * 프로그래머스의 [[ps:problems:programmers:42576]]과 완전히 동일한 문제이다. 풀이는 그쪽 참고.

===== 코드 =====
<dkpr py>
"""Solution code for "BOJ 10546. 배부른 마라토너".

- Problem link: https://www.acmicpc.net/problem/10546
- Solution link: http://www.teferi.net/ps/problems/boj/10546
"""

import collections
import sys


def main():
    N = int(sys.stdin.readline())
    counter = collections.Counter(x.rstrip() for x in sys.stdin)
    answer = next(x for x, count in counter.items() if count % 2 == 1)
    print(answer)


if __name__ == '__main__':
    main()

</dkpr>

{{tag>BOJ ps:problems:boj:실버_4}}