// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
using namespace std;
bool custom(string s, string t){
if(s.size()==t.size()) return s<t;
return s.size()<t.size();
}
int checkBranch(vector<vector<int>>& adj, vector<string>& names, int parent, int node, int depth){
if(names[parent]==names[node]) depth++;
int sdepth = depth;
for(int v : adj[parent]){
if(names[v].size()<names[node].size()) continue;
int pos = 0;
for(char c : names[v]){
if(c==names[node][pos]){
pos++;
if(pos==names[node].size()){
depth = checkBranch(adj, names, v, node, depth+1);
break;
}
}else pos=0;
}
}
if(sdepth==depth) adj[parent].push_back(node);
return depth;
}
int main() {
int n;
cin>>n;
vector<string> names(n+1);
for(int i=0;i<n;i++) cin>>names[i];
names[n]="zzzzzzzzzzz";
sort(names.rbegin(),names.rend(),custom);
int total = 0;
names[0] = "";
vector<vector<int>> adj(n+1);
for(int i=1;i<=n;i++){
// cout<<total<<endl;
total+=checkBranch(adj, names, 0, i, 0);
}
// for(int i=0;i<=n;i++){
// cout<<"node: "<<i<<" "<<names[i]<<endl;
// for(int v : adj[i]) cout<<names[v]<<" "<<v<<" ";
// cout<<endl;
// }
cout<<total<<endl;
return 0;
}
