#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;
ifstream f("interclasari.in");
ofstream g("interclasari.out");
int ind[25],i,j,N,M,x;
vector<int> v;
int main()
{

    f>>N;
    for (i=1;i<=N;++i)
        {
           f>>M;
           for (j=1;j<=M;++j)
                f>>x,v.push_back(x);
        }
    sort(v.begin(),v.end());
    for (i=0;i<v.size();++i)
        g<<v[i]<<" ";
	return 0;
}