#include<iostream>
#include<string>
#include<vector>
#include<cstring>
#include<algorithm>

using namespace std;

int main()
{

	string s ="123456789";

	for(int i =s.size()-1 ; i>=0 ; i--)
	{
		if(i % 3  == 0 && i!=0 )
		{
			s.insert(i,",");
		}
	}

	cout<<s<<endl;

}