/* -*- coding: utf-8 -*-
 *
 * 893.cc:  No.893 お客様を誘導せよ - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 1000;
const int MAX_P = 100;
const int MAX_M = MAX_N * MAX_P;

/* typedef */

/* global variables */

int ps[MAX_N], as[MAX_N][MAX_P];
int cs[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int m = 0;
  for (int i = 0; i < n; i++) {
    scanf("%d", ps + i);
    for (int j = 0; j < ps[i]; j++) scanf("%d", &as[i][j]);
    m += ps[i];
  }
  //printf("m=%d\n", m);

  for (int k = 0; k < m;) {
    for (int i = 0; i < n; i++)
      if (cs[i] < ps[i]) {
	if (k) putchar(' ');
	printf("%d", as[i][cs[i]++]);
	k++;
      }
  }
  putchar('\n');
  return 0;
}