class clock
{
    public static void main(String args[])
    {
        int sec = 0;
        int min = 0;
        int hour = 0;
        {
            for(hour=1;hour<3;hour++)
            {
                for(min=0;min<60;min++)
                {
                    for(sec=0;sec<60;sec++)
                    {
                        System.out.println(hour+":"+ min+":"+sec);
                        try{Thread.sleep(1000);}
                        catch(Exception e){}
                        for(int i=0;i<100;i++)
                        {
                            System.out.println("");
                        }
                    }

                }
            }

        }
    }
}