A~D 중 중복을 허용하여 알파벳을 골라 만든 6글자 단어가 있다.
별다줄 장인 J씨는 알파벳 3개를 순서대로 뽑아서 줄임말을 만드려고 한다.
이때 J씨가 만든 줄임말이 ADD 였다면, 원래 단어가 될 수 있는 경우의 수는 몇가지일까?
단, 줄임말이 ADD라는 것은 단어의 형태가
__A__D__D__ 라는 뜻이다.
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