#include <iostream>

int main()
{
	int num;
	std::cin >> num;
	int keta = 0;
	for (int i = 0, n = num; i < 10; i++)
	{
		n /= 10;
		keta++;
		if (n == 0)
		{
			break;
		}
	}
	int a;
	for (int i = 0, n = keta; i < n; i++)
	{
		a = num;
		for (int j = 0; j < keta - 1; j++)
		{
			a /= 10;
		}
		std::cout << a % 10;
		keta--;
		if (keta != 0 && keta % 3 == 0)
		{
			std::cout << ",";
		}
	}
	std::cout << std::endl;

	return 0;
}