program ideone;

function normalize (n: real): byte;
begin
  if n <> 0 then
	  if n > 0 then
	  	normalize := 2
	  else
	  	normalize := 0
  else
	normalize := 1
end;

procedure print_sector(x,y : real);
begin
	case (normalize(x) * 3 + normalize(y)) of
		0: writeln('left bottom');
		1: writeln('left center');
		2: writeln('left top');
		3: writeln('center bottom');
		4: writeln('center center');
		5: writeln('center top');
		6: writeln('right bottom');
		7: writeln('right center');
		8: writeln('right top');
	end;

end;

var x,y: real;
begin
	x:=1; y:=-1;
	print_sector(x, y);
end.