#include <bits/stdc++.h>

 using namespace std;

 vector<vector<int>> v;

 int main()

 {

     string s;

     while (cin >> s)

     {

         set<int> x, y;

         for (int i = ; i < v.size(); i++) v[i].clear();

         bool no_ans = false;

         for (int i = ; i < s.length(); i++)

         {

             if (s[i] == '')

             {

                 if (x.empty()) { no_ans = true; break; }

                 auto be = x.begin();

                 int tmp = *be;

                 x.erase(be);

                 v[tmp].push_back(i);

                 y.insert(tmp);

             }

             else

             {

                 if (y.empty()) { v.push_back(vector<int>()); y.insert(v.size() - ); }

                 auto be = y.begin();

                 int tmp = *be;

                 y.erase(be);

                 v[tmp].push_back(i);

                 x.insert(tmp);

             }

         }

         for (int i = ; i < v.size(); i++)

         {

             if (v[i].size() && s[v[i].back()] == '') no_ans = true;

         }

         if (no_ans) cout << - << endl;

         else

         {

             cout << v.size() << endl;

             for (int i = ; i < v.size(); i++)

             {

                 cout << v[i].size() << " ";

                 for (int j = ; j < v[i].size(); j++)

                 {

                     cout << v[i][j] +  << " ";

                 }

                 cout << endl;

             }

         }

     }

     return ;

 }