#include <iostream>

using namespace std;

int main()
{
	int a,b;

	cin >> a;
	cin >> b;

	if(a>b)
	{
		cout << endl;
		return 0;
	}

	cout << a;

	for(int i = a+1; i < b+1; i++)
	{
		cout << ",";
		cout << i;
	}
	cout << endl;
	return 0;

}