class program {
    program() {
        line();       
        turnoff();
    }


    void turnback(){
        turnleft();
        turnleft();
    }

    void turnright(){
        turnback();
        turnleft();
    }

    void moveToWall(){
        while(frontIsClear()){
            move();
        }
    }

    void moveToBeeper(){
        while (notNextToABeeper() && frontIsClear()){
            move();
        }
    }

    void moveToSpace(){
        while (nextToABeeper()  && frontIsClear()){
            move();
        }
    }

    void skyline(){
        if (nextToABeeper() && facingSouth()){
            pickbeeper();
            skyline();
            skyline();
        }else{
            if (facingSouth()){
                moveToWall();
                turnback();
            }else{
                if (notNextToABeeper() && anyBeepersInBeeperBag()){
                    putbeeper();
                }
                move();
            }
        }
    }

    void line(){
        moveToSpace();
        moveToBeeper();
        if (nextToABeeper()){
            turnback();
            skyline();
        }else{
            turnright();
            if (frontIsClear()){
                move();
                turnright();
                moveToWall();
                turnback();
            }else{
                return();
            }
        }
        line();
    }
}