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?: secretcode 문자열의 자리수 만큼만 비교
push, pop 연산을 위해 List 형 자료 구조 생성
List에 들어가는 자료 수의 제한을 두고 key 입력시 최대 갯수 초과시
자름
join을 이용해 List형 자료를 하나의 문자열로 치환 후 includes메소드
를 이용해 확인