int main()
{

	int n;
	cin >> n;
	vector<pair<int, int>> data;
	for (int i = 0; i < n; i++) {
		int l, r;
		cin >> l >> r;
		data.push_back(make_pair(l, r));
	}
	stable_sort(data.begin(), data.end(), cmp);
	for (int i = 0; i < n; i++) {
		cout << data[i].first << " " << data[i].second << endl;
	}

	return 0;
}