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#include <bits/stdc++.h>
using namespace std;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
int N, M, x;
struct cmp
{
bool operator()(int a, int b)
{
return a > b;
}
};
priority_queue<int, vector<int>, cmp> H;
int main()
{
fin >> N;
for(int i = 1; i <= N; i ++)
{
fin >> M;
for(int j = 1; j <= M; j ++)
{
fin >> x;
H.push(x);
}
}
fout << H.size() << '\n';
while(!H.empty())
{
fout << H.top() << ' ';
H.pop();
}
return 0;
}