import java.util.Calendar;
import java.util.GregorianCalendar;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
class FindDay {
/** Return the name of the given numeric week day */
public static String weekDayName(int weekNumber) {
return switch (weekNumber) {
case Calendar.MONDAY -> "Δευτέρα";
case Calendar.TUESDAY -> "Τρίτη";
case Calendar.WEDNESDAY -> "Τετάρτη";
case Calendar.THURSDAY -> "Πέμπτη";
case Calendar.FRIDAY -> "Παρασκευή";
case Calendar.SATURDAY -> "Σάββατο";
case Calendar.SUNDAY -> "Κυριακή";
default -> throw new IllegalStateException("Unexpected value: " + weekNumber);
};
}
public static void main(String args[]) throws Exception {
// ...
}