#include <bits/stdc++.h>
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
using ll = long long;
using ld = long double;
using VI = vector<int>;
using VL = vector<ll>;
using VS = vector<string>;
template<class T> using PQ = priority_queue<T, vector<T>, greater<T>>;
#define FOR(i,a,n) for(int i=(a);i<(n);++i)
#define eFOR(i,a,n) for(int i=(a);i<=(n);++i)
#define rFOR(i,a,n) for(int i=(n)-1;i>=(a);--i)
#define erFOR(i,a,n) for(int i=(n);i>=(a);--i)
#define each(i, a) for(auto &i : a)
#define SORT(a) sort(a.begin(),a.end())
#define rSORT(a) sort(a.rbegin(),a.rend())
#define fSORT(a,f) sort(a.begin(),a.end(),f)
#define all(a) a.begin(),a.end()
#define out(y,x) ((y)<0||h<=(y)||(x)<0||w<=(x))
#define tp(a,i) get<i>(a)
#define line cout << "-----------------------------\n" 
#define ENDL(i,n) ((i) == (n) - 1 ? "\n" : " ")
#define stop system("pause")
constexpr ll INF = 1000000000;
constexpr ll LLINF = 1LL << 60;
constexpr ll mod = 1000000007;
constexpr ll MOD = 998244353;
constexpr ld eps = 1e-10;
constexpr ld pi = 3.1415926535897932;
template<class T>inline bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; }return false; }
template<class T>inline bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; }return false; }
inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); }
template<class T>inline istream& operator>>(istream& is, vector<T>& v) { for (auto& a : v)is >> a; return is; }
template<class T>inline istream& operator>>(istream& is, deque<T>& v) { for (auto& a : v)is >> a; return is; }
template<class T, class U>inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template<class T>inline vector<T> vec(size_t a) { return vector<T>(a); }
template<class T>inline vector<T> defvec(T def, size_t a) { return vector<T>(a, def); }
template<class T, class... Ts>inline auto vec(size_t a, Ts... ts) { return vector<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); }
template<class T, class... Ts>inline auto defvec(T def, size_t a, Ts... ts) { return vector<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); }
template<class T>inline void print(const T& a) { cout << a << "\n"; }
template<class T, class... Ts>inline void print(const T& a, const Ts&... ts) { cout << a << " "; print(ts...); }
template<class T>inline void print(const vector<T>& v) { for (int i = 0; i < v.size(); ++i)cout << v[i] << (i == v.size() - 1 ? "\n" : " "); }
template<class T>inline void print(const vector<vector<T>>& v) { for (auto& a : v)print(a); }
inline string reversed(const string& s) { string t = s; reverse(all(t)); return t; }

class rollinghash {
    int base1 = 1007, base2 = 2009;
    int mod1 = 1000000007, mod2 = 998244353;
    VI hash1, hash2, power1, power2;
public:
    rollinghash(const string& s) {
        int n = s.size();
        hash1.resize(n + 1);
        hash2.resize(n + 1);
        rFOR(i, 0, n) {
            hash1[i] = (ll(hash1[i + 1]) * base1 + s[i]) % mod1;
            hash2[i] = (ll(hash2[i + 1]) * base2 + s[i]) % mod2;
        }
    }
    inline pair<int, int> hash(int l, char c) const {
        return { (ll(hash1[l]) * base1 + c) % mod1, (ll(hash2[l]) * base2 + c) % mod2 };
    }
    inline pair<int, int> hash(int l) const {
        return { hash1[l], hash2[l] };
    }
};

int main() {
    init();

    int n; cin >> n;
    VS s(n);
    vector<rollinghash> h;
    h.reserve(n);
    vector<pair<int, int>> a(n);
    FOR(i, 0, n) {
        cin >> s[i];
        h.emplace_back(s[i]);
        a[i] = h[i].hash(0);
    }
    SORT(a);

    ll ans = 0;
    FOR(i, 0, n) {
        VI cnt(26);
        each(j, s[i])++cnt[j - 'a'];
        rFOR(j, 1, s[i].length()) {
            FOR(k, 0, 26) {
                if (cnt[k] == 0)continue;
                auto itr = lower_bound(all(a), h[i].hash(j + 1, 'a' + k));
                if (itr != a.end() && *itr == h[i].hash(j + 1, 'a' + k))++ans;
            }
            --cnt[s[i][j] - 'a'];
        }
    }
    print(ans);

    return 0;
}

Measured memory_bytes: 47240