/// :3
#pragma GCC optimize("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;

#include "bits/stdc++.h"

#define pb push_back
#define F first
#define S second
#define f(i, a, b)  for(int i = a; i < b; i++)
#define all(a)  a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define sz(x) (int)(x).size()
#define mp(x,y) make_pair(x,y)
#define popCnt(x) (__builtin_popcountll(x))
//#define int ll

using ll = long long;
using ii = pair<int, int>;
using ull = unsigned long long;

const int N = 3e5+5, LG = 18, MOD = (119 << 23) + 1;
const long double PI = acos(-1);
const long double EPS = 1e-7;
const int dx[] = {1,1,0,-1,-1,-1,0,1};
const int dy[] = {0,1,1,1,0,-1,-1,-1};

void doWork() {

    int n;
    cin >> n;
    vector<vector<string>> vs(n);
    f(i,0,n) {
        int k;  cin >> k;
        vs[i].resize(k);
        f(j,0,k)    cin >> vs[i][j];
    }

    cout << vs[0].size() << '\n';
    for(auto x : vs[0])
        cout << x << '\n';



}
int32_t main() {
#ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif // ONLINE_JUDGE
    int t = 1;
//    cin >> t;
    while (t--) {
        doWork();
    }
    return 0;
}