#include <bits/stdc++.h>
using namespace std;

int main() {
	int N;
	cin >> N;

	vector<int> v;
	while (N) {
		v.push_back(N % 1000);
		N /= 1000;
	}

	int s = v.size();
	for (int i = s; 0 < i; i--) {
		cout << v.at(i-1);
		if (i == 1) {
			cout << endl;
		}
		else {
			cout << ',';
		}
	}
}