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

struct boi
{
    string s;
    bool isnew = 0;
};

struct comp
{
    bool operator()(const boi &b1, const boi &b2)
    {
        return lexicographical_compare(b1.s.begin(), b1.s.end(), b2.s.begin(), b2.s.end());
    };
};

int main()
{
    int n;
    cin >> n;
    set<boi, comp> z;
    for (int i = 0; i < n; ++i)
    {
        boi b;
        cin >> b.s;
        z.insert(b);
    }
    int totallen = 0;
    for (auto it = z.begin(); it != z.end(); ++it)
    {
        if (it->isnew) continue;
        string s = it->s, s1 = "";
        for (int i = 0; i < s.length(); ++i)
        {
            s1 += s[i];
            if (z.find(s1) == z.end())
            {
                boi b1;
                b1.s = s1;
                b1.isnew = 1;
                z.insert(b1);
                totallen += i+1;
                break;
            }
        }
    }
    cout << totallen;
}