#include <bits/stdc++.h>
#include <malloc.h>

using namespace std;

const int SIGMA = 26;
const int NR_CELLS = 115000;
const int Lmax = 20;

struct  __attribute__((__packed__)) List
{
    int node:18;
    int urm:18;
    char letter:6;
};

struct __attribute__((__packed__)) Trie
{
    int head:18;
    
    int nrAparitii:17;
    char nrSons:5;
    
    Trie(): nrSons(0), nrAparitii(0), head(0)
    {
    }
};

List Lista[NR_CELLS];
Trie T[NR_CELLS];
int root, size, contor;

void initTrie()
{
    root = 0;
    size = root + 1;
}

inline void addToList( const int node, const int val, const int letter )
{
    contor++;
    Lista[contor].node = val;
    Lista[contor].letter = letter;
    Lista[contor].urm = T[node].head;
    T[node].head = contor;
}

inline void eraseList( const int node )
{
    T[node].head = 0;
}

inline void eraseFromList( const int node, const int letter )
{
    if ( T[node].head == 0 )
        return;
    
    if ( Lista[ T[node].head ].letter == letter )
    {
        T[node].head = Lista[ T[node].head ].urm;
    }
    else
    {
        int pred = T[node].head;
        
        while ( Lista[ pred ].urm != 0 && Lista[ Lista[ pred ].urm ].letter != letter )
            pred = Lista[ pred ].urm;
        
        int deSters = Lista[ pred ].urm;
        
        Lista[ pred ].urm = Lista[ deSters ].urm;
    }
}

inline int NEXT( const int node, const int letter )
{
    int p = T[node].head;
    
    while ( p != 0 )
    {
        if ( Lista[p].letter == letter )
            return Lista[p].node;
        
        p = Lista[p].urm;
    }
    
    return 0;
}

void insert( char *s )
{
    int node = root;
    
    for ( ; *s; s++ )
    {
        int ch = *s - 'a';
        int urm = NEXT( node, ch );
        
        if ( urm == 0 )
        {
            urm = size++;
            addToList( node, urm, ch );
            T[node].nrSons++;
        }
        
        node = urm;
    }
    
    T[node].nrAparitii++;
}

int stiva[Lmax + 1];
int top;

void erase( char *s )
{
    int node = root;
    top = 0;
    
    for ( ; *s; s++ )
    {
        int ch = *s - 'a';
        
        node = NEXT( node, ch );
        
        assert( node != 0 );
        
        stiva[ ++top ] = node;
    }
    
    T[node].nrAparitii--;
    
    while ( T[node].nrAparitii == 0 && T[node].nrSons == 0 && node != root )
    {
        s--;
        
        eraseList( node );
        
        node = stiva[ --top ];
        eraseFromList( node, *s - 'a' );
        T[node].nrSons--;
    }
}

int count( char *s )
{
    int node = root;
    
    for ( ; *s; ++s )
    {
        int ch = *s - 'a';
        int urm = NEXT( node, ch );
        
        if ( urm == 0 )
            break;
        else
            node = urm;
    }
    
    if ( *s )
        return 0;
    else
        return T[node].nrAparitii;
}

int prefix( char *s )
{
    int sol = 0;
    int node = root;
    
    for ( ; *s; ++s )
    {
        int ch = *s - 'a';
        int urm = NEXT( node, ch );
        
        if ( urm == 0 )
            break;
        else
        {
            sol++;
            node = urm;
        }
    }
    
    return sol;
}

void validareTest()
{
    ifstream in("trie.out");
    ifstream ok("tests//grader_test20.ok");
    
    if ( !in || !ok )
    {
        cerr << "File output/ok missing!";
        exit( 0 );
    }
    
    int mySOl, correctSol;
    
    while( in >> mySOl )
    {
        ok >> correctSol;
        
        if ( mySOl != correctSol )
        {
            cerr << "Wrong Answer " << mySOl << " " << correctSol << "\n";
            exit( 0 );
        }
    }
    
    cerr << "Accepted\n";
    
    in.close();
    ok.close();
}

int main()
{
    FILE *in = fopen("trie.in", "r");
    FILE *out = fopen("trie.out", "w");
    
    if ( !in )
    {
        cerr << "Missing input file\n";
        exit( 0 );
    }
    
    initTrie();
    
    int tip;
    char s[Lmax + 1];
    
    while ( fscanf( in, "%d %s", &tip, s ) == 2 )
    {
        switch ( tip )
        {
            case 0: insert( s ); break;
            case 1: erase( s ); break;
            case 2: fprintf(out, "%d\n", count( s )); break;
            case 3: fprintf(out, "%d\n", prefix( s )); break;
        }
    }
    
    fclose( in );
    fclose( out );
    
    ///validareTest();
    ///malloc_stats(); /// MEMORY TEST
    
    return 0;
}