#include <bits/stdc++.h>
using namespace std;
using int64 = long long;
int main() {
	int n, t; 
	cin >> n >> t;
	vector<int64> masks(n);
	for (int i = 0; i < t; ++i) {
		int k;
		cin >> k;
		vector<int> a(k);
		for (int &j : a) {
			cin >> j; --j;
		}
		sort(a.begin(), a.end());
		if (a[0] == 0) {
			for (int j : a) masks[j] |= (1LL << i);
		} else {
			int64 mask = 0;
			for (int j : a) mask |= masks[j];
			for (int j : a) masks[j] = mask;
		}
	}
	for (int i = 0; i < n; ++i) if (masks[i] == masks[0]) cout << i + 1 << '\n';
	return 0;
}

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NQozCjIgMSAzCjIgMiAxCjQgMiAxIDQgNQ==

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