06. Unique Usernames

#include <iostream>
#include <string>
#include <set>

using namespace std;

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

    string name;

    set<string> names;

    for (int i = 0; i < n; i++) {
        cin >> name;
        names.insert(name);
    }

    for (auto& n : names) {
        cout << n << endl;
    }

    return 0;
}