문제
2009년 날짜가 주어졌을 때, 무슨 요일인지 출력하는 프로그램을 작성하시오.
출력
2009년 M월 D일의 요일을 영어로 출력한다. 출력은 다음 중 하나이다. "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday".
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