문제
두 자연수 l과 u가 주어졌을 때, l보다 크거나 같고, u보다 작거나 같은 모든 자연수의 자리수의 합을 구하는 프로그램을 작성하시오.
출력
l과 r을 포함하여 그 사이에 있는 모든 수의 자리수의 합을 출력한다.
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