G

#include<iostream>
#include<map>
using namespace std;
#define ll long long int

int main()
{
    ll i, j, k, n; cin >> n;
    string a;
    char ch;
    map<string, ll>mp;
    for (i = 0; i < n; i++)
    {
        string s;
        cin >> ch >> a;
        ll lagbe = 18 - a.length();
        for (j = 0; j < lagbe; j++)
        {
            s.push_back('0');
        }
        k = 0;
        for (j = lagbe; j <= 18; j++)
        {
            if ((a[k] - 48) % 2 == 0)
                s.push_back('0');
            else
            {
                s.push_back('1');
            }
            k++;
        }
        if (ch == '+')
        {
            mp[s]++;
        }
        else if (ch == '-')
        {
            mp[s]--;
        }
        else if (ch == '?')
        {
            cout << mp[s] << endl;
        }
    }
}