var a,b,c,prv,dru,tre:integer;
begin

  readln(a,b,c);

  while a<>0 do
  begin

     if (a>=b)and(a>=c)then
     begin
        prv:=a;
        if b>=c then
		begin
         dru:=b; tre:=c;
        end
        else
        begin
         dru:=c; tre:=b;
        end;

     end;

     if (b>=a)and(b>=c)then
     begin
        prv:=b;
        if a>=c then
		begin
         dru:=a; tre:=c;
        end
        else
        begin
         dru:=c; tre:=a;
        end;

     end;

     if (c>=a)and(c>=b)then
     begin
        prv:=c;
        if a>=b then
		begin
         dru:=a; tre:=b;
        end
        else
        begin
         dru:=b; tre:=a;
        end;

     end;


     if prv>=dru+tre then writeln('none')
     else
     begin

     if prv*prv>dru*dru+tre*tre then writeln('obtuse');

     if prv*prv=dru*dru+tre*tre then writeln('right');

     if prv*prv<dru*dru+tre*tre then writeln('acute');
     end;

     readln(a,b,c);
  end;


end.