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문제

Champernown constant is an irrational number represented in decimal by “0.” followed by concatenation of all positive integers in the increasing order. The first few digits of this constant are: 0.123456789101112 .. .

Your task is to write a program that outputs the K digits of Chapnernown constant starting at the N-th place for given two natural numbers K and N.

입력

The input has multiple lines. Each line has two positive integers N and K (N ≤ 109 , K ≤ 100) separated by a space.

The end of input is indicated by a line with two zeros. This line should not be processed.

출력

For each line, output a line that contains the K digits.

예제 입력 1

4 5
6 7
0 0

예제 출력 1

45678
6789101