getline 사용문제:
https://haula.tistory.com/entry/%EB%B0%B1%EC%A4%80-BOJ-9093%EB%B2%88-%EB%8B%A8%EC%96%B4%EB%92%A4%EC%A7%91%EA%B8%B0-C-%ED%92%80%EC%9D%B4%EB%B2%95