#include <cstdio>
#include <cstring>
  
#define CH (*s - 'a')
  
using namespace std;
  
struct Trie {
    int cnt, nrfii;
    Trie *fiu[ 26 ];
  
    Trie() {
        cnt = nrfii = 0;
        memset( fiu, 0, sizeof( fiu ) );
    }
};
  
Trie *T = new Trie;
 int ok;
  
int del( Trie *nod, char *s ) {
    if( *s == '\n' )
        nod->cnt --;
    else if( del( nod->fiu[ CH ], s+1 ) ) {
            nod->fiu[ CH ] = 0;
            nod->nrfii --;
        }
  
    if( nod->cnt == 0 && nod->nrfii == 0 && nod != T ) {
        delete nod; return 1;
    }
    return 0;
}
  
 
void ins( Trie *nod, char *s )
{
    for(;*s!='\n';s++)
    {
        if(nod->fiu[CH]==0)
        {
        nod->fiu[CH]=new Trie;
        nod->nrfii++;
        }
        nod=nod->fiu[CH];
    }
    nod->cnt++;
}
 
int pre( Trie *nod, char *s, int k ) {
 
    for(;*s!='\n';s++)
    {
        if(nod->fiu[CH]!=0)
            {
                nod=nod->fiu[CH];
                k++;
            }
        else break;
    }
return k;
}
 
int que( Trie *nod, char *s ) {
 
    for(;*s!='\n';s++)
    {
        if(nod->fiu[CH]!=0)
                nod=nod->fiu[CH];
        else return 0;
    }
return nod->cnt;
}
 
 
int main() {
    char line[ 32 ];
  
    freopen( "trie.in", "r", stdin );
    freopen( "trie.out", "w", stdout );
  
    fgets( line, 32, stdin );
  
    while( !feof( stdin ) ) {
        switch( line[0] ) {
            case '0': ins ( T, line+2 ); break;
            case '1': del( T, line+2 ); break;
            case '2': printf( "%d\n", que( T, line+2 ) ); break;
            case '3': printf( "%d\n", pre( T, line+2, 0 ) ); break;
        }
  
        fgets( line, 32, stdin );
    }
    return 0;
}