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#include <fstream>
#include <map>
using namespace std;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
int n, m, i, j, k, sum, x;
map <int,int> s;
int main()
{
fin>>k;
for(i=1;i<=k;i++)
{
fin>>n;
sum+=n;
for(j=1;j<=n;j++)
{
fin>>x;
s[x]++;
}
}
fout<<sum<<'\n';
for(map<int,int>::iterator it=s.begin();it!=s.end();it++)
{
int aux=it->second, aux2=it->first;
for(i=1;i<=aux;i++)
fout<<aux2<<' ';
}
return 0;
}