bard.cpp

// Michael Pfeifer
// Version 04, 2018/02/17

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef unsigned int uint;
typedef unsigned long long ull;

const ld  pi   = 4.0*atanl(1.0);
const int iinf = 1e9 + 10;
const ll  inf  = 1e18 + 10;
const int mod  = 1000000007;
const ld  prec = .000001;

#define enld endl
#define endl '\n'
#define pb push_back
#define debug(x) cout<<#x<<" -> "<<x<<'\n'
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define uni(x) (x).erase(unique(all(x)), (x).end())
#define rep(i, n) for (ll i = 0; i < (ll)(n); ++i)
#define rep1(i, n) for (ll i = 1; i <= (ll)(n); ++i)
#define umap unordered_map
#define uset unordered_set

template<class TIn>
using indexed_set = tree<
        TIn, null_type, less<TIn>,
        rb_tree_tag, tree_order_statistics_node_update>;

void fast() {
    ios::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
}

void file() {
    auto a = freopen("a.in",  "r", stdin);
    auto b = freopen("a.out", "w", stdout);
    if(!a || !b) cout << "uh oh" << endl;
}





int main() {
    //file();
    //fast();

    int n;
    cin >> n;

    vector<set<int>> v(n+1);

    int bardcnt = 0;

    int nights;
    cin >> nights;
    while(nights--) {
        int villagers;
        cin >> villagers;

        bool bardhere = false;

        vector<int> present(villagers);
        for(auto& i : present) {
            cin >> i;
            if(i == 1) {
                bardhere = true;
            }
        }

        if(bardhere) {
            for(auto i : present) {
                v[i].insert(bardcnt);
            }
            bardcnt++;
        }
        else {
            set<int> all;
            for(auto i : present) {
                for(auto j : v[i]) {
                    all.insert(j);
                }
            }
            for(auto i : present) {
                v[i] = all;
            }
        }
    }

    for(int i = 1; i <= n; i++) {
        if(v[i].size() == bardcnt) {
            cout << i << endl;
        }
    }

    return 0;
}