#include <bits/stdc++.h>
using namespace std;
int K,N,i,j,k=1,v[20000001],cnt;
int main()
{
    ifstream fin("interclasari.in");
    ofstream fout("interclasari.out");
    fin >> K;
    for(i=1;i<=K;i++)
    {
        fin >> N;
        for(j=1;j<=N;j++)
        {
            fin >> v[k++];
        }
        cnt += N;
    }
    sort(v+1,v+k);
    fout << cnt << endl;
    for(i=1;i<k;i++)
    {
        fout << v[i] << " ";
    }
}