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*.

The input has multiple lines. Each line has two positive integers *N* and *K* (*N* ≤ 10^{9}, *K* ≤ 100)
separated by a space.

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

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

4 5 6 7 0 0

45678 6789101

Source: ACM International Collegiate Programming Contest
, ACM-ICPC Japan Alumni Group Practice Contest 2009, 2009-11-01

http://jag-icpc.org/

http://jag-icpc.org/