#include<fstream>
using namespace std;
ifstream f("interclasari.in");
ofstream g("interclasari.out");
int k;
int n,nr;
int s,fr[1000002];
int main()
{
    f>>k;
    for(;k;--k)
    {
        f>>n;
        s+=n;
        for(;n;--n)
            f>>nr,fr[nr]++;
    }
    g<<s<<'\n';
    for(int i=0;i<=1000000;++i)
        for(int j=1;j<=fr[i];++j)
                g<<i<<" ";
    return 0;

}