#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int N; cin >> N;
	vector<string> v[21];
	rep(i, N) {
		int num; cin >> num;
		if (num == 0) {
			int n, m; cin >> n >> m;
			rep(i, m) {
				string S; cin >> S;
				v[n].push_back(S);
			}
		}
		else if (num == 1) {
			bool flag = true;
			string S; cin >> S;
			rep(i, 20) {
				auto itr = find(v[i + 1].begin(), v[i + 1].end(), S);
				if (itr != v[i + 1].end()) {
					cout << i + 1 << endl;
					v[i + 1].erase(itr);
					flag = false;
					break;
				}
			}
			if (flag)
			cout << -1 << endl;
		}
		else if (num == 2) {
			int k; cin >> k;
			while (v[k].size() != 0) v[k].pop_back();
		}
	}

    return 0;
}