week2 1764듣보잡 정재홍 #46
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집합의 intersection을 이용하여 풀었습니다.
처음부터 set()을 이용하여 자료구조를 생성한 뒤,
intersection으로 공통된 자료를 추출,
list로 변환하여 sort를 진행하였습니다.