문제
구간 [a,b]의 자리 합이란 그 구간에 포함되는 모든 숫자의 각 자리를 합한 것이다. 예를 들어, [28,31]의 자리합은 아래와 같다.
2+8 + 2+9 + 3+0 + 3+1 = 28
두 수 a와 b가 주어졌을 때, [a,b]의 자리 합을 구하는 프로그램을 작성하시오.
출력
각 테스트 케이스에 대해서, [a,b]의 자리 합을 출력한다.
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