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

template <class T, class U>
void chmin(T& t, const U& u) {
    if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
    if (t < u) t = u;
}

int main() {
    int n;
    cin >> n;
    vector<string> s(n);
    rep(i, n) cin >> s[i];

    vector<vector<ll>> dist(26, vector<ll>(26));
    vector<ll> plus(26);
    rep(i, n) {
        string t = s[i];
        sort(t.begin(), t.end());
        if (s[i] != t) continue;

        int m = s[i].size();
        int start = *(s[i].begin()) - 'a';
        int end = *(s[i].rbegin()) - 'a';
        if (start == end) {
            plus[start] += m;
        } else {
            for (int j = 0; j <= start; j++) {
                chmax(dist[j][end], m);
            }
        }
    }

    ll ans = 0;
    vector<ll> v(26);
    rep(i, 26) {
        for (int j = i + 1; j < 26; j++) {
            chmax(v[j], v[i] + dist[i][j] + plus[i]);
        }
    }

    rep(i, 26) chmax(ans, v[i] + plus[i]);
    cout << ans << endl;
}