#include <cstdio>
#include <cstring>
#include <stack>

using namespace std;

const int MAX  = 1000000;

struct Trie {
    int sons [26];
    int father, count, weight;
    Trie () {
    }
    Trie (int x) {

       father = x;

    }
};

Trie trie [MAX];
char s [20];
int l, u = 0;
stack <int> st;

void add () {
    int node = 1, i;
    for (i = 0; i < l; i ++) {
        ++ trie [node].weight;
        if (trie [node].sons [s [i] - 'a'] == 0) {
            if (st.empty ()) {
                trie [++ u] = Trie (node);
                trie [node].sons [s [i] - 'a'] = u;
            }
            else {
                trie [st.top ()] = Trie (node);
                trie [node].sons [s [i] - 'a'] = st.top ();
                st.pop ();
            }
        }
        node = trie [node].sons [s [i] - 'a'];
    }
    ++ trie [node].weight;
    ++ trie [node].count;
}

void erase (int node, int i) {
    if (i == l) {
        -- trie [node].count;
        -- trie [node].weight;
        if (node != 1 && trie [node].weight == 0) {
            trie [trie [node].father].sons [s [i - 1] - 'a'] = 0;
            st.push (node);
        }
        return;
    }
    erase (trie [node].sons [s [i] - 'a'], i + 1);

    --trie [node].weight;
    if (node != 1 && trie [node].weight == 0) {
        trie [trie [node].father].sons [s [i] - 'a'] = 0;
        st.push (node);
    }
}

int find () {
    int node, i;
    node = 1;
    for (i = 0; i < l && node; i ++)
        node = trie [node].sons [s [i] - 'a'];
    return node;
}

int query () {
    int node = 1, i;
    for (i = 0; i < l && node; i ++)
        node = trie [node].sons [s [i] - 'a'];
    if (i == l && node)
        return l;
    else return i - 1;
}

int main () {
    int type, node;
    char space;
    double size;

    freopen ("trie.in", "r", stdin);
    freopen ("trie.out", "w", stdout);

    trie [++ u] = Trie ();
    while (scanf ("%d", &type) != EOF) {
        scanf ("%c", &space);
        gets (s);
        l = strlen (s);
        if (type == 0)
            add ();
        else
            if (type == 1)
                erase (1, 0);
            else
                if (type == 2) {
                    node = find ();
                    if (node != 0)
                        printf ("%d\n", trie [node].count);
                    else printf ("0\n");
                }
                else
                    printf ("%d\n", query ());
    }
    size = sizeof (trie) / 1024 / 1024;
    printf ("%lf\n", size);
    return 0;
}