#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i < (n); i++)
using namespace std;
using ll = long long;

int ctoi(char x){
    return x - 'a';
}

int main(){
    ios::sync_with_stdio(false);
    int N; cin>>N;

    vector<string> pos;
    rep(i,N){
        string s; cin>>s;
        string t=s;
        sort(s.begin(), s.end());
        if(s==t) pos.push_back(s);
    }
    
    for(string x:pos){
        cerr << x << endl;
    }

    vector<vector<int>> moji(26,vector<int>(26,0));
    for(string x:pos){
        int l=ctoi(x[0]), r=ctoi(x[x.size()-1]);
        int len=x.size();
        moji[l][r]=max(moji[l][r], len);
    }

    rep(i,26){
        rep(j,26){
            cerr << moji[i][j] << " ";
        }cerr << endl;
    }
    cerr << "-------------------" << endl;

    int ans=0;
    vector<int> dp(26,0);
    for(int r=0; r<26; r++){
        for(int l=0; l<=r; l++){
            if(r==l) dp[r] = max(dp[r],moji[r][r]);
            if(r>0 && r!=l){
                dp[r] = max(dp[r], dp[l]+moji[l][r]+moji[r][r]);
            }
        }
        // dp[r] += moji[r][r];
        ans = max(ans,dp[r]);
    }

    rep(i,26){
        cerr << dp[i] << " ";
    }cerr << endl;

    cout << ans << endl;
}