func_code_string: #include <bits/stdc++.h>   using namespace std;   string last_w =   ;   set<string> reserved;   void change_last_w() {     do {       int j(last_w.size() - 1);       while (j >= 0 && last_w[j] ==  z ) --j;       if (j == -1)         last_w.assign(last_w.size() + 1,  a );       else {         ++last_w[j];         for (int i(j + 1); i < last_w.size(); ++i) last_w[i] =  a ;       }     } while (reserved.count(last_w));   }   bool valid_char(char c) {     return isdigit(c) || isalpha(c) || c ==  _  || c ==  $ ;   }   int parse_word(const string& s) {     if (s.empty()) return 0;     if (isdigit(s[0])) return false;     int ans(0);     while (ans < s.size() && valid_char(s[ans])) ++ans;     return ans;   }   int parse_num(const string& s) {     if (s.empty()) return 0;     int ans(0);     while (ans < s.size() && isdigit(s[ans])) ++ans;     return ans;   }   int parse_reserved(const string& s) {     if (s.empty()) return 0;     int best(0);     string t;     for (int i(0); i < min<size_t>(20UL, s.size()) && s[i] !=  # ; ++i) {       t += s[i];       if (reserved.count(t)) best = i + 1;     }     return best;   }   int parse_all(const string& s) {     return max({parse_num(s), parse_reserved(s), parse_word(s)});   }   vector<string> parse(string s) {     vector<string> ans;     while (!s.empty() && s[0] !=  # ) {       int cnt(0);       while (cnt < s.size() && s[cnt] ==    ) ++cnt;       if (cnt) {         s = s.substr(cnt, s.size() - cnt);         continue;       }       int cur(parse_all(s));       ans.push_back(s.substr(0, cur));       s = s.substr(cur, s.size() - cur);     }     return ans;   }   vector<int> parse_len(string s) {     vector<int> ans;     while (!s.empty()) {       int cnt(0);       while (cnt < s.size() && s[cnt] ==    ) ++cnt;       if (cnt) {         s = s.substr(cnt, s.size() - cnt);         continue;       }       int cur(parse_all(s));       ans.push_back(cur);       s = s.substr(cur, s.size() - cur);     }     return ans;   }   int main() {     ios_base::sync_with_stdio(false);     int n;     cin >> n;     string s__;     for (int i(0); i < n; ++i) {       cin >> s__;       reserved.insert(s__);     }     cin >> n;     getline(cin, s__);     vector<string> tokens;     while (n--) {       getline(cin, s__);       auto add = parse(s__);       copy(begin(add), end(add), back_inserter(tokens));     }     map<string, string> was;     for (string& s : tokens)       if (!reserved.count(s) && !isdigit(s[0])) {         if (!was.count(s)) {           change_last_w();           was[s] = last_w;         }         s = was[s];       }     string ans;     int next_space(tokens.size());     for (int i(0); i < tokens.size(); ++i) {       string s(tokens[i]);       int j(i + 1);       while (true) {         if (j == tokens.size()) break;         s += tokens[j];         if (parse_all(s) != tokens[i].size()) {           next_space = min(next_space, j - 1);           break;         }         if (s.size() > 20) break;         ++j;       }       ans += tokens[i];       if (next_space == i) {         next_space = tokens.size();         ans +=    ;       }     }     cout << ans;   }   