#include <iostream>
#include <map>

using namespace std;

map <int, int> mp;

int main(){
    int t;
    scanf("%d", &t);
    while (t--){
        string op, str;
        cin>>op>>str;
        int x = 0;
        for (int i = 0; i < str.length(); i ++ ){
            x = x * 2 + (str[i] - '0')%2;
        }
        if (op == "+"){
            mp[x] ++ ;
        }
        else if (op == "-"){
            mp[x] -- ;
        }
        else {
            cout<<mp[x]<<endl;
        }
    }
}