func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 7 + (int)1e9;   long long process(string s) {     for (int i = 0; i < s.size(); i++) s[i] = (s[i] -  0 ) % 2 +  0 ;     return stoll(s);   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int n;     char c;     map<long long, int> m;     cin >> n;     while (n--) {       string a;       cin >> c >> a;       if (c ==  + ) {         m[process(a)]++;       } else if (c ==  - ) {         m[process(a)]--;       } else if (c ==  ? ) {         cout << m[stoll(a)] << endl;       }     }     return 0;   }   