#include <bits/stdc++.h>
#include <atcoder/all>
#include <boost/polygon/point_data.hpp>
#include <boost/polygon/voronoi.hpp>
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(x) begin(x),end(x)
#define sz(x) (int)(x).size()
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
using vll=vector<ll>;
using vvll=vector<vll>;
using vi=vector<int>;
using vvi=vector<vi>;
using pll=pair<ll,ll>;
using pi=pair<int,int>;

// using mint=modint998244353;

// using BoostPoint=boost::polygon::point_data<int>;
// using Voronoi=boost::polygon::voronoi_diagram<double>;

#line 2 "string/trie.hpp"

template <size_t X = 26, char margin = 'a'>
struct Trie {
  struct Node {
    array<int, X> nxt;
    vector<int> idxs;
    int idx;
    char key;
    Node(char c) : idx(-1), key(c) { fill(nxt.begin(), nxt.end(), -1); }
  };

  vector<Node> st;

  Trie(char c = '$') { st.emplace_back(c); }

  inline int &next(int i, int j) { return st[i].nxt[j]; }

  void add(const string &s, int x) {
    int pos = 0;
    for (int i = 0; i < (int)s.size(); i++) {
      int k = s[i] - margin;
      if (~next(pos, k)) {
        pos = next(pos, k);
        continue;
      }
      int npos = st.size();
      next(pos, k) = npos;
      st.emplace_back(s[i]);
      pos = npos;
    }
    st[pos].idx = x;
    st[pos].idxs.emplace_back(x);
  }

  int find(const string &s) {
    int pos = 0;
    for (int i = 0; i < (int)s.size(); i++) {
      int k = s[i] - margin;
      if (next(pos, k) < 0) return -1;
      pos = next(pos, k);
    }
    return pos;
  }

  int move(int pos, char c) {
    assert(pos < (int)st.size());
    return pos < 0 ? -1 : next(pos, c - margin);
  }

  int size() const { return st.size(); }

  int idx(int pos) { return pos < 0 ? -1 : st[pos].idx; }

  vector<int> idxs(int pos) { return pos < 0 ? vector<int>() : st[pos].idxs; }
};


int main()
{
  	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int N;
	cin>>N;
	Trie<26,'a'>tr;
	vi last(1,-1),cnt(1,0);
	ll ans=0;
	rep(i,0,N){
		string s;
		cin>>s;
		tr.add(s,i);
		last.resize(tr.size(),-1),cnt.resize(tr.size(),0);
		int pos=0;
		for(auto c:s){
			pos=tr.move(pos,c);
			if(last[pos]==i-1)cnt[pos]++;
			else cnt[pos]=1;
			last[pos]=i;
			ll t=cnt[pos];
			ans+=t*(t+1)/2;
		}
	}
	cout<<ans<<'\n';

}