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// Source: https://usaco.guide/general/io
#include <bits/stdc++.h>
using namespace std;
ifstream f("interclasari.in");
ofstream g("interclasari.out");
priority_queue<int,vector<int>,greater<int>> pq;
int n,k,x,s,last;
int main() {
f>>k;
for(int i=1;i<=k;i++)
{
f>>n;
s+=n;
for(int j=1;j<=n;j++)
{
f>>x;
pq.push(x);
}
}
g<<s<<'\n';
last=pq.top();
g<<last<<' ';
pq.pop();
while(!pq.empty())
{
if(pq.top()!=last)
g<<pq.top()<<' ';
last=pq.top();
pq.pop();
}
}