import java.util.*;

public class OrderDate{

    public static void main(String[] args){

        Date[] days = new Date[5];

        days[0] = new Date(2020,1,1);

        days[1] = new Date(2019,2,1);

        days[2] = new Date(2019,3,1);

        days[3] = new Date(2019,2,6);

        days[4] = new Date(2022,5,1);

        OrderDate o = new OrderDate();

        o.bubbleSort(days);

        o.show(days);

    }

    public void bubbleSort(Date[] days){

        Date temp;

        for(int i=days.length-1;i>0;i--){

            for(int j=0;j<i;j++){

                if(days[j].compareTo(days[j+1])>0){

                    temp = days[j+1];

                    days[j+1] = days[j];

                    days[j] = temp;

                }

            }

        }

    }

    public void show(Date[] days){

        for(Date d : days){

            System.out.println(d.getYear()+"-"+d.getMonth()+"-"+d.getDate());

        }

    }

}