use POSIX;
while(<DATA>){
	chomp;
	($l, $r)=split/ /;
	printf "[%2d %2d] ", $l, $r;
	for $i(-9..10){
		$i or print "|";
		printf "%2d ", floor (($i - $l ) / ($r - $l +1 )) <=> 0
		}
	print "\n"
	}
__DATA__
1 4
2 5
3 7
0 3
-1 5
-8 -2