class Day implements Comparable {

    public static String treatDayStr(String dayStr)
    {
        if (!dayStr.contains("-"))
        {
            dayStr = dayStr.substring(0, 4) + "-" + dayStr.substring(4, 6) + "-" +
                    dayStr.substring(6, 8);
        }
        return dayStr;
    }

    public  Day(String dayStr);
    public  Day(String dayStr, List<Integer> hours);

}