문제
중복 없는 수는 각 숫자(1, 2, 3, ..., 9)가 최대 한 번씩 등장하고, 숫자 0은 포함하지 않는 수이다. 따라서 중복 없는 수는 최대 9자리로 이루어질 수 있다. 중복 없는 수의 예시로는 9, 32, 489, 98761, 983245 등이 있다.
정수 N이 주어질 때, N보다 크면서 가장 작은 중복 없는 수를 출력하는 프로그램을 작성하라.
출력
각 테스트 케이스마다 답을 출력한다. 만약 답에 해당하는 수가 없는 경우는 0을 출력한다.
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