#include<stdio.h>
int Total(int num, int n)
{
	if (num > 999) {
		return Total(num / 1000, n + 1);
	}
	else {
		return n;
	}
}
void New(int num, int n, int y)
{
	if (num > 999) {
		New(num / 1000, n + 1, y);
	}
	if (n == y) {
		printf("%d", num);
	}
	else {
		printf("%3d", num % 1000);
	};
	if (n > 1) printf(",");
}
int main()
{	int x, y;
	scanf("%d", &x);
	y = Total(x, 1);
	New(x, 1, y);
	return 0;
}