문제
문자열 A의 부분 문자열이란, A에 속하는 하나 또는 그 이상의 문자(연속하지 않아도 된다)를 이용해서 만든 새로운 문자열이다. 이때, A에서의 순서를 그대로 유지해야 된다.
두 문자열 A와 B가 주어진다. 이때, A의 부분 문자열이면서, B의 부분 문자열이 아닌 가장 짧은 부분 문자열을 구하는 프로그램을 작성하시오.
출력
첫째 줄에 A의 부분 문자열이면서, B의 부분 문자열이 아닌 가장 짧은 부분 문자열의 길이를 출력하고, 둘째 줄에는 문자열을 출력한다. 만약, 가능한 문자열이 여러 가지인 경우에는 아무거나 출력한다.
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