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