#include <iostream>

using namespace std;
//ifstream fin("interclasari.in");
//ofstream fout ("interclasari.out");
int v[1000001],l,i,x,j,n,k;
int main()
{
cin>>k;
for(j=1;j<=k;j++)
{
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>x;
        v[x]++;
        l++;
    }
}
i=0;
while(l>=0)
{
    while(v[i]>0)
    {
        cout<<i<<" ";
        v[i]--;
        l--;
    }
    i++;
}
    return 0;
}