func_code_string: #include <bits/stdc++.h>   using namespace std;   map<int, vector<string> > mp;   string s;   int n, pos = 0;   ;   void dfs(int lvl) {     int j = pos;     while (s[j] !=  , ) j++;     mp[lvl].push_back(s.substr(pos, j - pos));     pos = j + 1;     j++;     while (s[j] !=  , ) j++;     int ct = stoi(s.substr(pos, j - pos));     pos = j + 1;     for (int i = 1; i <= ct; i++) dfs(lvl + 1);   }   int main() {     cin >> s;     s +=  , ;     n = s.length();     while (pos < n) dfs(1);     cout << mp.size() <<   n ;     for (auto it = mp.begin(); it != mp.end(); it++) {       vector<string> vec = (*it).second;       for (string str : vec) cout << str <<    ;       cout <<   n ;     }   }   