#include "bits/stdc++.h"
#define ALL(obj) (obj).begin(),(obj).end()
#define RALL(obj) (obj).rbegin(),(obj).rend()
#define REP(i, n) for(int i = 0; i < int(n); i++)
#define FOR(i,n,m) for(int i = int(n); i < int(m); i++)
using namespace std;
typedef long long ll;
const int MOD = 1e9 + 7;
const int INF = MOD - 1;
const ll LLINF = 4e18;

int main() {
    int n; cin >> n;
    vector<queue<int>> a(n);
    vector<int> ans;
    int empty = 0;
    REP(i, n) {
        int p; cin >> p;
        if (p == 0) empty++;
        REP(j, p) {
            int b; cin >> b;
            a[i].push(b);
        }
    }
    int now = -1;
    while (empty < n) {
        now = (now + 1) % n;
        if (a[now].empty()) continue;
        ans.push_back(a[now].front());
        a[now].pop();
        if (a[now].empty()) empty++;
    }
    REP(i, ans.size()) {
        cout << ans[i] << " ";
    }
    cout << endl;
}