#include <bits/stdc++.h>
using namespace std;
 
const int MAX = 105;
vector<int> adj[MAX];
bool visited[MAX];
int n;
 
void readInput() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        int k;
        cin >> k;
        for (int j = 0; j < k; j++) {
            int v;
            cin >> v;
            // Chỉ thêm cạnh nếu chưa tồn tại
            if (find(adj[i].begin(), adj[i].end(), v) == adj[i].end()) {
                adj[i].push_back(v);
            }
            if (find(adj[v].begin(), adj[v].end(), i) == adj[v].end()) {
                adj[v].push_back(i);
            }
        }
    }
}
 
void dfs(int u) {
    visited[u] = true;
    for (int v : adj[u]) {
        if (!visited[v]) {
            dfs(v);
        }
    }
}
 
int dem_so_tplt(int ignore = -1) {
    memset(visited, false, sizeof(visited));
    int count = 0;
    for (int i = 1; i <= n; i++) {
        if (i == ignore) continue;
        if (!visited[i]) {
            count++;
            dfs(i);
        }
    }
    return count;
}
 
void tim_dinh_tru() {
    vector<int> dt;
    int so_tplt_ban_dau = dem_so_tplt();
    for (int u = 1; u <= n; u++) {
        int tplt_moi = dem_so_tplt(u);
        if (tplt_moi > so_tplt_ban_dau) {
            dt.push_back(u);
        }
    }
    cout << dt.size() << endl;
    for (int i : dt) cout << i << " ";
    cout << endl;
}
 
int main() {
    readInput();
    tim_dinh_tru();
    return 0;
}

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