func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   using ld = long double;   using pii = pair<int, int>;   constexpr int MAXN = 100005;   int n;   string type[MAXN], word[MAXN];   bitset<30> to_bs(const string& s) {     bitset<30> res;     for (char c : s) {       res[c -  a ] = true;     }     return res;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     cin >> n;     bitset<30> all = to_bs( abcdefghijklmnopqrstuvwxyz );     int ans = 0;     for (int i = 0; i < n; ++i) {       cin >> type[i] >> word[i];       bitset<30> cur = to_bs(word[i]);       if (type[i][0] ==  ! ) {         if (all.count() <= 1) {           ans += 1;         }         all = all & cur;       } else if (type[i][0] ==  . ) {         all = all & cur.flip();       } else {         if (all.count() == 1) ans += 1;         all.reset(word[i][0] -  a );       }     }     cout << max(0, ans - 1) <<   n ;     return 0;   }   