#include<stdio.h>
#include<string.h>
FILE *in=fopen("trie.in","rt");
FILE *out=fopen("trie.out","wt");
typedef struct Trie
{
 struct Trie *next[26];
 int count,childs;
}Trie;
Trie *trie;
Trie* mkTrie()
{
  Trie *t = new Trie;
  memset(t->next,0,sizeof(t->next));
  t->childs=t->count=0;
  return t;
}
int normChar(char c)
{
  return c-'a';
}
void insertWord(Trie *where,char *w)
{
  if(w==NULL)
  {
    ++where->count;
    return;
  }
  if(where->next[normChar(*w)])
   insertWord(where->next[normChar(*w)],w+1);
  else
  {
    ++where->childs;
    where->next[normChar(*w)]=mkTrie();
    insertWord(where->next[normChar(*w)],w+1);
  }
}
int removeWord(Trie *where,char *w)
{
  if(w==NULL)
   --where->count;
  else if(removeWord(where->next[normChar(*w)],w+1))
  {
    where->next[normChar(*w)]=0;
    --where->childs;
  }
  if(!where->count && !where->childs && (where!= trie))
  {
    delete where;
    return 1;
  }
  return 0;
}
int countOccs(Trie *where,char *w)
{
  for(;*w;++w)
   if(where->next[normChar(*w)])
    where = where->next[normChar(*w)];
   else
    return 0;
  return where->count;
}
int longestPrefix(Trie *where,char *w)
{
  int len = 0;
  for(;*w&&where->next[normChar(*w)];++w)
  {
    ++len;
    where = where->next[normChar(*w)];
  }
  return len;
}
void printPath(Trie *where,char *w)
{
  for(;*w&&where;++w)
   printf("(%d %d)-%c->",where->count,where->childs,*w);
  printf("(%d %d)\n",where->count,where->childs);
}

int main()
{
  int op;
  char w[32];
  trie = mkTrie();
  while(fscanf(in,"%d %s",&op,w)!=EOF)
   switch(op)
   {
     case 0: insertWord(trie,w);break;
     case 1: removeWord(trie,w);break;
     case 2: fprintf(out,"%d\n",countOccs(trie,w));break;
     case 3: fprintf(out,"%d\n",longestPrefix(trie,w));break;
   }
  fclose(in);
  fclose(out);
  return 0;
}