#include "bits/stdc++.h"

using namespace std;
using ll = long long;

bool isGood(const string& s) {
    for (int i = 1; i < s.size(); ++i) {
        if (s[i - 1] > s[i]) {
            return false;
        }
    }
    return true;
}

int dp(int curr, char last, const vector<pair<pair<char, char>, int>>& S, vector<int>& memo) {
    if (curr == S.size()) {
        return 0;
    }
    if (memo[curr] >= 0) {
        return memo[curr];
    }

    int ret = 0;
    if (last <= S[curr].first.first) {
        int take = dp(curr + 1, S[curr].first.second, S, memo) + S[curr].second;
        int skip = dp(curr + 1, last, S, memo);
        ret = max(take, skip);
    }
    else {
        ret = dp(curr + 1, last, S, memo);
    }
    memo[curr] = ret;
    return ret;
}

void Main() {
    int N;
    cin >> N;
    vector<pair<pair<char, char>, int>> S;
    for (int i = 0; i < N; ++i) {
        string s;
        cin >> s;
        if (isGood(s)) {
            S.push_back(make_pair(make_pair(s[0], s[s.size() - 1]), s.size()));
        }
    }
    sort(S.begin(), S.end());

    if (S.size() == 0) {
        cout << 0 << endl;
        return;
    }
    vector<int> memo(S.size() + 10, -1);
    int ans = dp(0, 'a', S, memo);
    cout << ans << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}