#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>;

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

    vector<vector<ll>> dp(n + 1, vector<ll>(26));
    rep(i, n) {
        rep(j, 26) dp[i + 1][j] = dp[i][j];

        string t = s[i];
        sort(t.begin(), t.end());
        if (s[i] != t) continue;

        int m = s[i].size();
        int next = *(s[i].rbegin()) - 'a';
        for (int j = 0; j <= (s[i][0] - 'a'); j++) {
            dp[i + 1][next] = max(dp[i + 1][next], dp[i][j] + m);
        }
    }

    ll ans = 0;
    rep(i, 26) ans = max(ans, dp[n][i]);

    cout << ans << endl;
}