#include <iostream>
#include <string>
#include <Windows.h>
using namespace std;

void main(){
	int n = 0;
	int i = 1;


	while (true){

		cout << string( n, ' ') << "***   ***   ***   ***"  << endl;
		n = n + i;
		if (n == 10 || n == 0){
			i = -1 * i;


		}


		Sleep(50);






	}