#include <algorithm>
#include <iostream>
#include <vector>

using std::string;
using std::cin;
using std::cout;

int main() {
    int k;
    cin >> k;

    int counters[100] = { 0 };

    for(int i = 0; i < k; ++i) {
        int n;
        cin >> n;

        for(int j = 0; j < n; ++j) {
            int number;
            cin >> number;
            counters[number]++;
        }
    }

    for(int i = 0; i < 100; ++i) {
        for(int j = 0; j < counters[i]; ++j) {
            cout << i << " ";
        }
    }

    return 0;
}