#include <bits/stdc++.h>
using namespace std;

#define int long long
#define rep(i,l,r) for(int i=(int)(l);i<(int)(r);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
template<class T>bool chmax(T &a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T &a,T b){if(a>b){a=b;return 1;}return 0;}

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
}*/

signed main()
{
  map<int, vector<string>> cus;
  int Q; cin >> Q;
  while(Q--){
    int d; cin >> d;
    if(d == 0){
      int n, m; cin >> n >> m;
      rep(i, 0, m){
        string a; cin >> a;
        cus[n].pb(a);
      }
    }else if(d == 1){
      string b; cin >> b;
      bool f = false;
      for(auto& it : cus){
        for(auto& j : it.second){
          if(b == j){
            cout << it.first << endl;
            j.clear();
            f = true;
            break;
          }
        }
        if(f) break;
      }
      if(!f) cout << -1 << endl;
    }else{
      int c; cin >> c;
      cus[c].clear();
    }
  }

  return 0;
}