import java.util.Calendar;

class FindDay {
  /** Return the name of the given numeric week day */
  public static String weekDayName(int weekDayNumber) {
    switch (weekDayNumber) {
    case Calendar.MONDAY: return "Δευτέρα";
    case Calendar.TUESDAY: return "Τρίτη";
    case Calendar.WEDNESDAY: return "Τετάρτη";
    case Calendar.THURSDAY: return "Πέμπτη";
    case Calendar.FRIDAY: return "Παρασκευή";
    case Calendar.SATURDAY: return "Σάββατο";
    case Calendar.SUNDAY: return "Κυριακή";
    }
    return null;
  }

  public static void main(String args[]) throws Exception {
  // ...
}