func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string in =  111 ;     cin >> in;     vector<vector<int>> result;     set<int> last1, last0;     for (int i = 0; i < in.size(); i++) {       if (in[i] ==  0 ) {         if (last1.empty()) {           result.push_back({i});           last0.insert(result.size() - 1);         } else {           int cur = *last1.begin();           result[cur].push_back(i);           last1.erase(cur);           last0.insert(cur);         }       } else {         if (last0.empty()) {           cout << -1;           return 0;         } else {           int cur = *last0.begin();           result[cur].push_back(i);           last0.erase(cur);           last1.insert(cur);         }       }     }     if (last1.size()) {       cout << -1;       return 0;     }     cout << result.size() << endl;     for (auto &it : result) {       cout << it.size() <<    ;       for (auto it2 : it) {         cout << (it2 + 1) <<    ;       }       cout << endl;     }   }   