import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;


public class T {
    public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");
        Date date = new Date();
        System.out.println(sdf.format(date));
        System.out.println(sdf.format(getLastDate(date)));
    }
    
    private static Date getLastDate(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.MONTH, -1);
        return cal.getTime();
    }
}