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처음에는 문자 교체, 삽입, 삭제 각각 다른 메서드로 구현해야 하는줄 알고 그렇게 풀다가(MainFail)
도저히 안풀려서 답지를 봤다.(Solution). 하지만, 답지를 최대한 이해해 보려했으나 아직 조금 헤깔리는 점들이 남아 있다.