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#include <fstream>
#include <queue>
using namespace std;
ifstream fin ("interclasari.in");
ofstream fout ("interclasari.out");
priority_queue<int> que;
int k, n, val;
int main()
{
fin>>k;
for(int i=1; i<=k; i++)
{
fin>>n;
for(int j=1; j<=n; j++)
{
fin>>val;
que.push(-val);
}
}
fout<<que.size()<<'\n';
while(!que.empty())
{
fout<<-que.top()<<' ';
que.pop();
}
return 0;
}