ABC353E

#include <assert.h>
#include <bits/stdc++.h>
using namespace std;
#ifndef __DEBUG__
#define dbg(...) 42
#endif
template <class T> using mpq = priority_queue<T, vector<T>, greater<T>>;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vl = vector<ll>;
using vi = vector<int>;

const ll maxn = 3e5 + 3;
ll now = 0;
vl hit(maxn);
ll dict[maxn][26];

void insert(const string &str)
{
    ll u = 0;
    for (auto c : str) {
        ll offset = c - 'a';
        if (dict[u][offset] == 0)
            dict[u][offset] = ++now;
        u = dict[u][offset];
        hit[u] += 1;
    }
}
ll get(const string &str)
{
    ll u = 0, ret = 0;
    for (auto c : str) {
        ll offset = c - 'a';
        if (dict[u][offset] == 0)
            return ret;
        u = dict[u][offset];
        ret += hit[u];
    }
    return ret;
}

int main(int argc, char **argv)
{
    ll n;
    cin >> n;
    vector<string> vs(n);
    for (auto &x : vs)
        cin >> x;

    ll ans = 0;
    for (const auto &x : vs) {
        ll v = get(x);
        dbg(x, v);
        ans += v;
        insert(x);
    }
    cout << ans << endl;
    return 0;
};