#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
multiset <int> v;
int k,i,n,j,x,s;
int main()
{
    fin>>k;
    for(i=1;i<=k;i++)
    {
        fin>>n;
        for(j=1;j<=n;j++)
        {
            fin>>x;
            v.insert(x);
        }
        s+=n;
    }
    fout<<s<<"\n";
    multiset <int> :: iterator i=v.begin();
    while(!v.empty())
    {
        fout<<*i<<" ";
        v.erase(v.find(*i));
        i=v.begin();
    }
    return 0;
}