#include<fstream>
using namespace std;

int a[4000005];

int main(){
	ifstream cin("interclasari.in");
	ofstream cout("interclasari.out");
	int K,N,i,x,xmax=0,sm=0;
	
	cin>>K;
	while(K--)
	{
		cin>>N;
		sm += N;
		for(i=1;i<=N;++i)
		{
			cin>>x;
			a[x]++;
			if(x > xmax) xmax = x;
		}
		
	}
	cout<< sm << '\n';
	for(i=0;i<=xmax;++i)
	  if(a[i])
	  {
	  	while(a[i])
	  	{
	  		cout<< i << ' ';
	  		--a[i];
	  	}
	  }
	
	
	
	return 0;
}