class program {

    void east()
    {
    	while(notFacingEast)
        	turnleft();
    }
    
    void south()
    {
    	while(notFacingSouth)
        	turnleft();
    }
    
    void findWall()
    {
    	while(frontIsClear)
        	move();
    }
    
    void checkStep()
    {
    	move();
        east();
        move();
        if(frontIsBlocked)
        {
        	turnleft();
        }else
        {
        	south();
        }
    }

    program () {
        east();
        findWall();
        turnleft();
        
        while(facingNorth)
        {
        	checkStep();
        }
        
        turnoff();
    }
}