#include <bits/stdc++.h>
using namespace std;
#define rep(i, x, limit) for (long long i = (long long)x; i < (long long)limit; i++)
#define REP(i, x, limit) for (long long i = (long long)x; i <= (long long)limit; i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define el '\n'
#define spa " "
#define Yes cout << "Yes" << el
#define No cout << "No" << el
#define YES cout << "YES" << el
#define NO cout << "NO" << el
#define inp(x) for(auto &i:x)cin>>i
#define eps (1e-10)
#define Equals(a,b) (fabs((a) - (b)) < eps )
#define debug(x) cerr << #x << " = " << x << el
using ll = long long;
using ull = unsigned long long;
using i128 = __int128_t;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vs = vector<string>;
using vb = vector<bool>;
const double pi = 3.141592653589793238;
const int inf = 1073741823;
const ll infl = 1LL << 60;
const string ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string abc = "abcdefghijklmnopqrstuvwxyz";
const ll MOD = 998244353;
#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using vm = vector<mint>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll n;cin>>n;
  vs S(n);inp(S);
  using T=tuple<ll,ll,ll>;
  priority_queue<T,vector<T>,greater<T>> pq;
  auto J=[&](string s){
    char c='a';
    for(auto x:s){
      if(x<c)return;
      c=x;
    }
    pq.push({*s.begin()-'a',*(s.end()-1)-'a',s.size()});
    return;
  };
  for(auto s:S){
    J(s);
  }
  vl ans(26,0);
  rep(i,0,26){
    if(i>0)ans[i]=max(ans[i-1],ans[i]);
    while(!pq.empty()){
      auto[a,b,c]=pq.top();
      if(a!=i)break;
      pq.pop();
      ans[b]=max(ans[b],ans[a]+c);
    }
  }
  cout<<ans[25]<<el;
}