문제
N부터 M까지의 수들을 종이에 적었을 때 종이에 적힌 0들을 세는 프로그램을 작성하라.
예를 들어, N, M이 각각 0, 10일 때 0을 세면 0에 하나, 10에 하나가 있으므로 답은 2이다.
출력
각각의 테스트 케이스마다 N부터 M까지의 0의 개수를 출력한다.
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