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#include <bits/stdc++.h>
using namespace std;
ifstream fin("interclasari.in");
ofstream fout("interclasari.out");
int v[20000002],k,n,nr_poze,i,j;
int main()
{
fin>>k;
for(i = 1; i <= k; i++)
{
fin>>n;
for(j=1; j<=n; j++)
fin>>v[++nr_poze];
}
sort(v+1,v+nr_poze+1);
fout<<nr_poze<<'\n';
for(i = 1; i <= nr_poze; i++)
fout<<v[i]<<' ';
return 0;
}