#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    vector<vector<int>> A(N);
    int nK = 0;
    rep(i,N) {
        int K; cin >> K;
        nK += K;
        vector<int> id(K);
        rep(i,K) cin >> id[i];
        reverse(id.begin(), id.end());
        A[i] = id;
    }

    vector<int> ans;
    while(nK > 0) {
        rep(i,N) {
            if(!A[i].empty()) {
                nK--;
                ans.push_back(A[i].back());
                A[i].pop_back();
            }
        }
    }

    for(int a : ans) cout << a << " "; cout << endl;
}