#include <fstream>
#include <queue>
using namespace std;
ifstream f("interclasari.in");
ofstream g("interclasari.out");
struct cmp{
    bool operator()(const int A,const int B) const
    {
        return A>B;
    }
};
priority_queue <int,vector<int>,cmp> Q;
int main()
{
    int k,sol=0,n,x;
    f>>k;
    for(int i=1;i<=k;i++)
    {
        f>>n;
        sol+=n;
        for(int j=1;j<=n;j++)
        {
            f>>x;
            Q.push(x);
        }

    }
    g<<sol<<"\n";
    while(sol>0)
    {
        g<<Q.top()<<" ";
        sol--;
        Q.pop();
    }
    return 0;
}