#include <bits/stdc++.h>
using namespace std;

#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for(int64 i = 0;i < (n);i++)
#define FOR(i, a, b) for(int64 i = (a);i < (b);i++)
#define all(x) x.begin(),x.end()
#define fs first
#define sc second

using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;

const double eps = 1e-10;

template<typename A, typename B>inline void chmin(A &a, B b){if(a > b) a = b;}
template<typename A, typename B>inline void chmax(A &a, B b){if(a < b) a = b;}

template<typename T>
vector<T> make_v(size_t a){return vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

template<typename T,typename U,typename... V>
typename enable_if<is_same<T, U>::value!=0>::type
fill_v(U &u,const V... v){u=U(v...);}

template<typename T,typename U,typename... V>
typename enable_if<is_same<T, U>::value==0>::type
fill_v(U &u,const V... v){
  for(auto &e:u) fill_v<T>(e,v...);
}

using T = tuple<int64, int64, int64>;


int main(void) {
    vector<int64> res;
    int64 n;
    cin >> n;
    vector<vector<int>> v(n);
    int64 mx = 0;
    REP(i, n) {
        int64 m;
        cin >> m;
        v[i].resize(m);
        REP(j, m) cin >> v[i][j];
        chmax(mx, m);
    }
    REP(i, mx) {
        REP(j, n) {
            if (v[j].size() > i) {
                res.push_back(v[j][i]);
            }
        }
    }
    REP(i, res.size()) {
        cout << res[i] << " ";
    }
    cout << endl;
}