#include <bits/stdc++.h>

using namespace std;

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

multiset < int > A;

int main(){
    int t, n, x, sum;
    fin >> t;
    sum = 0;
    while(t--){
        fin >> n;
        sum += n;
        for(int i = 1; i <= n; i++){
            fin >> x;
            A.insert(x);
        }
    }
    fout << sum << "\n";
    for(auto it : A){
        fout << it << " ";
    }
    return 0;
}