#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("interclasari.in");
ofstream out("interclasari.out");
int v[20000010],n,i,k,x;
int main()
{
    in>>k;
    i=1;
    while(k)
    {
        in>>x;
        n=n+x;
        for(;i<=n;i++)
            in>>v[i];
        k--;
    }
    sort(v+1,v+n+1);
    out<<n<<'\n';
    for(i=1;i<=n;i++)
        out<<v[i]<<" ";
    out<<'\n';
    in.close();
    out.close();
    return 0;
}