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#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
int K, N, Ni, predecesor;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
int main() {
fin >> K;
vector <int> r;
while (K--) {
fin >> N;
while (N--) {
fin >> Ni;
r.push_back(Ni);
}
}
sort(r.begin(), r.end());
fout << r.size() << '\n';
for (auto& x : r)
fout << x << " ";
fin.close(); fout.close();
return 0;
}