Lesson14

#include <iostream>
#include <unordered_map>

typedef long long ll;

using namespace std;

ll GetMask(ll a) {
  ll mask = 0;
  ll d = 1;
  while (a) {
    mask += (a & 1) * d;
    a /= 10;
    d *= 10;
  }
  return mask;
}

int main() {
  int n; cin >> n;
  unordered_map<ll, int> m;
  while (n--) {
    char command;
    ll value;
    cin >> command >> value;
    ll mask = GetMask(value);
    if (command == '+') {
      m[mask]++;
    } else if (command == '-') {
      m[mask]--;
    } else if (command == '?') {
      cout << m[mask] << "\n";
    }
  }
  return 0;
}