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

using namespace std;

ifstream in ("interclasari.in");
ofstream out ("interclasari.out");

vector <int> V;

int main()
{
    int N, K, i, j, S = 0, x;

    for (in >> K; K; K --){
        in >> N;
        S += N;

        for (j = 1; j <= N; j ++)
            in >> x, V.push_back (x);
    }

    sort (V.begin (), V.end ());

    out << S << "\n";
    for (i = 0; i < S; i ++)
        out << V[i] << " ";

    return 0;
}