#include <fstream>
#include <iostream>
#include <string>

#define ll long long
#define ull unsigned long long
#define pii std::pair<int, int>

#define IO (std::string) "trie"
std::ifstream cin(IO + ".in");
std::ofstream cout(IO + ".out");

#define NMAX 100

class Trie {
    int cnt = 0;
    int lvs = 0;
    Trie *next[26] = {};

public:
    void insert(const std::string& str, int pos = 0) {
        lvs++;
        if (pos == int(str.size()))
            cnt++;
        else {
            if (!next[str[pos] - 'a'])
                next[str[pos] - 'a'] = new Trie;
            next[str[pos] - 'a']->insert(str, pos + 1);
        }
    }

    void erase(const std::string& str, int pos = 0) {
        lvs--;
        if (pos == int(str.size()))
            cnt--;
        else {
            next[str[pos] - 'a']->erase(str, pos + 1);
            if (!next[str[pos] - 'a']->lvs) {
                delete next[str[pos] - 'a'];
                next[str[pos] - 'a'] = nullptr;
            }
        }
    }

    int count(const std::string& str, int pos = 0) {
        if (pos == int(str.size()))
            return cnt;
        if (!next[str[pos] - 'a'])
            return 0;
        return next[str[pos] - 'a']->count(str, pos + 1);
    }

    int lcp(const std::string& str, int pos = 0) {
        if (pos == int(str.size()))
            return 0;
        if (!next[str[pos] - 'a'])
            return 0;
        return 1 + next[str[pos] - 'a']->lcp(str, pos + 1);
    }
};


int main() {
  Trie tr;
  int op;
  std::string s;
  while (cin >> op >> s) {
    if (op == 0)
      tr.insert(s, 0);
    if (op == 1)
      tr.erase(s, 0);
    if (op == 2)
      cout << tr.count(s, 0) << '\n';
    if (op == 3)
      cout << tr.lcp(s, 0) << '\n';
  }
  return 0;
}