#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[8]={-1,0,1,0,1,1,-1,-1};
const ll dx[8]={0,-1,0,1,1,-1,1,-1};
template <typename T> inline bool chmax(T &a, T b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> inline bool chmin(T &a, T b) {
  return ((a > b) ? (a = b, true) : (false));
}
int main(){
  ll n;cin >> n;
  vector<vector<pl>> v(26);
  rep(i,n){
    string s;cin >> s;
    string t=s;sort(all(t));
    if(s==t)v[s[0]-'a'].push_back({(s.back()-'a'),s.size()});
  }
  rep(i,26)sort(all(v[i]));
  vector<ll> dp(26);
  rep(i,26){
    for(auto p:v[i]){
      if(p.fi==i)dp[i]+=p.se;
      else{
        for(int j=p.fi;j<26;j++){
          chmax(dp[j],dp[i]+p.se);
        }
      }
    }
    for(int j=i;j<26;j++)chmax(dp[j],dp[i]);
  }
  //rep(i,26)cout << dp[i] <<endl;
  cout << *max_element(all(dp)) <<endl;
}