#include <bits/stdc++.h>

#define el '\n'
#define ll long long
#define ld long double

#define Beevo ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

void testCase() {
    int n;
    cin >> n;

    int d;
    string s;
    vector<string> v[n];
    for (int i = 0; i < n; i++) {
        cin >> d;

        for (int j = 0; j < d; j++) {
            cin >> s;

            v[i].push_back(s);
        }
    }

    cout << v[0].size() << el;

    for (auto &i: v[0])
        cout << i << el;
}

signed main() {
    Beevo

    int T = 1;
//    cin >> T;

    while (T--)
        testCase();

    return 0;
}