import java.util.*;
class PoolC
{
	private int water=500;
	int pushWater()
	{
		Random rd=new Random();
		water=water+(rd.nextInt()>>>1)%600;
		return water;
	}
	int popWater()
	{
		Random rd=new Random();
		water=water-(rd.nextInt()>>>1)%600;
		return water;
	}
	public void isAllow()
	{
			if(water<50)
			{System.out.println("水庫(kù)水位過(guò)底，禁止抽水！");}
			if(water>=1000)
			{System.out.println("水庫(kù)超過(guò)警戒水位，禁止注水！");}
	}
};

class stateA implements Runnable
{
	private PoolC p;
	int downwater;
	public stateA(PoolC p)
	{
		this.p=p;
	}
	public void run()
	{
		while(true)
		{
	    Random rd=new Random();
		downwater=(rd.nextInt()>>>1)%1000;
		try{
			Thread.sleep(1000);
		   }
		   catch(Exception e){}
		   p.isAllow();//下層水庫(kù)是否允許抽水
		   if(downwater<50)
			{
		       System.out.println("下層水庫(kù)水位過(guò)底，禁止抽水！");
			}
		   else
		    {
			  p.pushWater();
			  System.out.println("泵站A注水中。");
			}
		}
	}
};

class stateB implements Runnable
{
	private PoolC pb;
	int upwater;
	public stateB(PoolC pc)
	{
		this.pb=pc;
	}
	public void run()
	{
	    Random rd=new Random();
		upwater=(rd.nextInt()>>>1)%1000;
	  while(true)
	  {
		try{
			Thread.sleep(1000);
		   }
		   catch(Exception e){}
		pb.isAllow();//上層水庫(kù)是否允許注水
		if (upwater>1000)
		{
			System.out.println("上層水庫(kù)超過(guò)警戒水位，禁止注水！");
		}
		else
		{
			pb.popWater();
			System.out.println("泵站B抽水中。");
		}
	  }
	}
};

class RunPool
{
	public static void main(String args[])
	{
		PoolC pc=new PoolC();
        stateA as=new stateA(pc);
		stateB bs=new stateB(pc);
		Thread a=new Thread(as);
		Thread b=new Thread(bs);
		a.start();
		b.start();
	};
};