#include <fstream>
#define ch s*s-'a'
#include <cstring>

using namespace std;

ifstream f("trie.in");
ofstream g("trie.out");

struct Trie
{
	short pr,rasp;
	Trie *fii[26];
};

Trie *t=new Trie();
int i,ma,c,rasp,nr;
char s[26];

void adauga(Trie *p,char *s)
{
	p->pr++;
	if(*s=='\0')
	{
		p->rasp++;
		return;
	}
	else
	{
		if(p->fii[ch]==NULL)
		{
			p->fii[ch]=new Trie();
		}
		adauga(p->fii[ch],s+1);
	}
}
void elimina(Trie *p,char *s)
{
	p->pr--;
	if(*s=='\0')
	{
		p->rasp--;
		return;
	}
	else
	{
		elimina(p->fii[ch],s+1);
	}
}
int calculeaza(Trie *p,char *s)
{
	if(*s=='\0')
	{
		f<<p->rasp<<"\n";
		return;
	}
	if(p->fii[ch]==NULL)
	{
		f<<0<<"\n";
		return;
	}
	calculeaza(p->fii[ch],s+1);
}
int cauta(Trie *p,char *s)
{
	if(*s!='\0' && p->fii[ch]!=NULL && p->fii[ch]->pr>0)
	{
		ma++;
		cauta(p->fii[ch],s+1);
	}
	else
	{
		f<<ma<<'\n';
	}
}
int main()
{
	while(f>>c)
	{
		f.get();
		f.getline(s,30);
		switch (c)
		{
			case 0:adauga(t,s);break;
			case 1:elimina(t,s);break;
			case 2:g<<calculeaza(t,s)<<'\n';break;
			case 3: 
			ma=0;
			g<<cauta(t,s)<<'\n';break;
		}
	}
	return 0;
}