include <bits/stdc++.h>

using namespace std;

int main()

{

int n;

int m;

cin >> n;

int sender;

int mentioned;

int a[101][101] = { 0 };

for (int i = 0; i < n; i++) {

cin >> sender;//sender表示接下来要发微博的人

cin >> m;//m表示接下来要Q的人数

for (int j = 0; j < m; j++) {

cin >> mentioned;

a[sender][mentioned]++;

}

}

int max = 1;

//max表示被Q到最多的人的下标

for (int i = 1; i <= 100; i++) {

for (int j = 1; j <= 100; j++) {

a[0][i] += a[j][i];

}

if (a[0][i] > a[0][max])

max = i;

}

cout << max << endl;

bool isfirst=true;

for (int i = 1; i <= 100; i++) {

if ((a[i][max]) && (isfirst)) {

cout << i;

isfirst = false;

}

else if ((a[i][max]) && (!isfirst))

cout << " " << i;

}

return 0;

}