解法一：模拟

#include <bits/stdc++.h>
using namespace std;
vector<vector<string>> info;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N, K;
    cin >> N >> K;
    info.resize(K);
    string name;
    int M, tmp;
    for (int i = 0; i < N; ++i) {
        cin >> name;
        cin >> M;
        for (int j = 0; j < M; ++j) {
            cin >> tmp;
            info[tmp - 1].emplace_back(name);
        }
    }
    int i = 1;
    for (auto &list:info) {
        cout << i << " " << list.size() << "\n";
        ++i;
        sort(list.begin(), list.end());
        for (auto &student:list) {
            cout << student << "\n";
        }
    }
}