#include <fstream>
#include <set>
using namespace std;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
int k,n[21],x,j,N,i;
multiset<int>s;
multiset<int>:: iterator it;
int main()
{fin>>k;
 for(i=1;i<=k;i++)
    {fin>>n[i];
     for(j=1;j<=n[i];j++)
        {fin>>x;
         s.insert(x);
        }
        N+=n[i];
    }
    fout<<N<<"\n";
 for(it=s.begin();it!=s.end();it++)
    fout<<*it<<" ";
}