#include <iostream>
#include <fstream>
using namespace std;
ifstream in("trie.in");
ofstream out("trie.out");

struct node {
    node *fii['z' - 'a' + 1];
    int frecv;
    int nr_fii;

    node() {
        frecv = 0;
        nr_fii = 0;
        for (int i = 0; i < 'z' - 'a' + 1; i++) {
            fii[i] = nullptr;
        }
    }
};

void add_word(node* nod, const string& word, int i = 0) {
    if (i == word.size()) {
        nod->frecv++;
        return;
    }

    if (nod->fii[word[i] - 'a'] == nullptr) {
        node* temp = new node();
        nod->fii[word[i] - 'a'] = temp;
        nod->nr_fii++;
        add_word(temp, word, i + 1);
    }
    else
        add_word(nod->fii[word[i] - 'a'], word, i + 1);
}

bool delete_word(node* nod, const string& word, int i = 0) {

    if (i == word.size()) {
        nod->frecv--;
        return (nod->frecv <= 0);
    }

    if (nod->fii[word[i] - 'a'] == nullptr) return false;

    if (delete_word(nod->fii[word[i] - 'a'], word, i + 1)) {
        delete nod->fii[word[i] - 'a'];
        nod->fii[word[i] - 'a'] = nullptr;

        nod->nr_fii--;
        if (nod->frecv <= 0 && nod->nr_fii == 0) return true;
    }
    return false;
}

int get_frecv(node* nod, const string& word, int i = 0) {
    if (i == word.size()) return nod->frecv;
    if (nod->fii[word[i] - 'a'] == nullptr) return 0;

    return get_frecv(nod->fii[word[i] - 'a'], word, i + 1);
}

int get_prefix(node* nod, const string& word, int i = 0) {
    if (i == word.size()) {
        return 0;
    }

    if (nod->fii[word[i] - 'a'] == nullptr) return 0;

    return get_prefix(nod->fii[word[i] - 'a'], word, i + 1) + 1;
}



int main() {
    node *root = new node();

    int op;
    while (in >> op) {
        string s;
        in >> s;

        switch (op) {
            case 0: {add_word(root, s); break;}
            case 1: {delete_word(root, s); break;}
            case 2: {out<<get_frecv(root, s) << endl; break;}
            case 3: {out<<get_prefix(root, s) << endl; break;}
            default: {
                break;
            }
        }
    }

    return 0;
}