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#include <bits/stdc++.h>
using namespace std;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
int k, L;
priority_queue< int >q;
void Citire()
{
int i, j, x;
fin >> k;
for(i = 1; i <= k; i++)
{
fin >> L;
for(j = 1; j <= L; j++)
{
fin >> x;
q.push(-x);
}
}
fout << q.size() << "\n";
while(!q.empty())
{
fout << -q.top() << " ";
q.pop();
}
}
int main()
{
Citire();
return 0;
}