int main()
{
ios_base::sync_with_stdio(0);
cin.tie(NULL);
int counter=0,n,i,j,l;
VI vis;
string str,str1,str2;
vector <string> v;
cin >>n;
for(i=0;i<n;i++)
{
cin >>str;
v.PB(str);
str1=getdomain(str);
str2=getlogin(str,str1);
mp[MP(str2,str1)].PB(i);
}
VI v1;
vis.resize(n,0);
for(i=0;i<n;i++)
{
if(!vis[i])
{
counter++;
str=v[i];
str1=getdomain(str);
str2=getlogin(str,str1);
v1=mp[MP(str2,str1)];
l=v1.size();
for(j=0;j<l;j++)
vis[v1[j]]=1;
}
}
cout <<counter<<"\n";
vis.assign(n,0);
for(i=0;i<n;i++)
{
if(!vis[i])
{
str=v[i];
str1=getdomain(str);
str2=getlogin(str,str1);
v1=mp[MP(str2,str1)];
l=v1.size();
cout <<l;
for(j=0;j<l;j++)
{
vis[v1[j]]=1;
cout <<" "<<v[v1[j]];
}
cout <<"\n";
}
}
return 0;
}
bool augmenting_path_bfs(int src, int dst, int mincap = 0) {
sp_par.assign(N, -1);
sp_D.assign(N, -1);
sp_D[src] = 0;
queue<int> q;
q.push(src);
while (!q.empty()) {
int cur = q.front();
q.pop();
for (int j = 0; j < (int) adj[cur].size(); ++j) {
int e = adj[cur][j];
int v = edges[e].v;
if (sp_D[v] < 0 && edges[e].cap - edges[e].flow > mincap) {
sp_D[v] = sp_D[cur] + 1;
sp_par[v] = e;
q.push(v);
}
}
}
return sp_D[dst] >= 0;
}
int main(){
int ncases;
int u, v, w, V, E;
scanf("%d",&ncases);
while(ncases--){
scanf("%d",&V);
AdjList.assign(V, VII());
for(int i=1; i<V; i++){
scanf("%d %d %d",&u, &v, &w);
AdjList[u-1].push_back(make_pair(v-1,w));
AdjList[v-1].push_back(make_pair(u-1,w));
}
dfs_num.assign(V, -1);
maxlen = -1;
dfs(0,0);
dfs_num.assign(V, -1);
maxlen = -1;
//printf("end %d\n",end);
dfs(end,0);
printf("%d\n",maxlen);
}
return 0;
}
int dinic(int s, int t) {
N = int(adj.size());
for (int j = 0; j < (int) edges.size(); ++j)
edges[j].flow = 0;
VI path;
int res = 0;
while ( augmenting_path_bfs(s, t) ) {
last_edge.assign(N, 0);
while (true) {
int cfp = update_flow_dfs(s, t);
if (cfp <= 0) break;
res += cfp;
}
}
return res;
}
void initSet(int n) {
pset.assign(n,0);
REP(i,n) pset[i]=i;
}