// TLE
// includes {{{
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<vector>
#include<stack>
#include<queue>
#include<map>
#include<set>
#include<tuple>
#include<cmath>
#include<random>
#include<cassert>
#include<bitset>
#include<cstdlib>
// #include<deque>
// #include<multiset>
// #include<cstring>
// #include<bits/stdc++.h>
// }}}
using namespace std;
using ll = long long;

int main() {
  std::ios::sync_with_stdio(false), std::cin.tie(0);
  int n;
  cin >> n;
  string t;
  cin >> t;
  const int S = 1e5;
  assert(1 <= t.size() && t.size() <= S);
  for(auto c : t) assert('a' <= c && c <= 'z');
  vector<vector<int>> cnt(S + 1);
  ll ans = t.size();
  assert(ans <= S);

  for(int i = 1; i < n; i++) {
    string s;
    cin >> s;
    for(auto c : s) assert('a' <= c && c <= 'z');
    assert(1 <= s.size() && s.size() <= S);
    int f = 0;
    while(f < s.size() && f < t.size() && s[f] == t[f]) f++;
    t = s;
    cnt.at(f).push_back(i);
    ans += s.size();
    assert(ans <= S);
  }
  vector<int> used(n+1);
  used[0] = used[n] = 1;
  for(int i = 0; i <= S; i++) {
    for(int j : cnt[i]) {
      ll x = 1;
      while(!used[j-x]) x++;
      ll y = 1;
      while(!used[j+y]) y++;
      ans += ((x * x * y + x * y * y) / 2 + x * y) * i;
      used[j] = 1;
    }
  }
  cout << ans << endl;
  return 0;
}