#include <bits/stdc++.h>
using namespace std;

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

int main() {
    int n; cin >> n;

    auto ctoi = [](char c) {
        return c - 'a' + 1;
    };

    auto s = vec<tuple<int, int, int>>(uns, 0);
    while (n--) {
        string v; cin >> v;
        if (is_sorted(begin(v), end(v))) {
            s.push_back({ ctoi(v.front()), ctoi(v.back()), size(v) });
        }
    }

    sort(begin(s), end(s), [](auto x, auto y) {
        return make_tuple(get<1>(x), get<0>(x)) < make_tuple(get<1>(y), get<0>(y));
    });

    auto dp = vec<int>(0, size(s) + 1, ctoi('z') + 1);

    dp[0][0] = 0;
    for (int i = 1; i <= size(s); ++i) {
        auto [f, b, l] = s[i - 1];
        for (int j = 0; j <= ctoi('z'); ++j) {
            dp[i][j] = dp[i - 1][j];
            if (b <= j) {
                chmax(dp[i][j], dp[i - 1][f] + l);
            }
        }
    }

    cout << dp[size(s)][ctoi('z')] << endl;
}