import java.util.*;

public class NumOutSleep extends Thread{
private int id;
private static int max=30;
private static int tnum=4;
private Random r=new Random();

	NumOutSleep(int id){ this.id=id; }

	public void run(){
		for(int i=0; i<max; i++){
			System.out.print(id+" ");
			try{Thread.currentThread().sleep(r.nextInt(2));}
			catch(Exception e){}
		}
	}

	public static void main(String[] args){
		// Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
		for(int i=0; i<tnum; i++)
			new NumOutSleep(i+1).start();
	}
}