#include <vector>

class shift_vector : public std::vector<int>
{
public:
  shift_vector() : std::vector<int>() {}

  void shift_left()
  {
    if (size() == 0)
    {
      return;
    }

    /* Join consecutive equal numbers. */
    for (unsigned int i = 1; i < size(); ++i)
    {
      if (at(i-1) == at(i))
      {
        at(i-1) += at(i);
        at(i) = 0;
      }
    }

    /* Remove empty positions. */
    unsigned int d = 0;
    for (unsigned int i = 0; i < size(); ++i)
    {
      if (at(i) != 0)
        at(d++) = at(i);
    }
    
    /* Make remainder empty. */
    for ( ; d < size(); ++d)
    {
      at(d) = 0;
    }
  }
  
private:
};


#include <iostream>
#include <iterator>

using namespace std;

int main()
{
  shift_vector v;

  istream_iterator<int> begin(cin);
  istream_iterator<int> end;

  copy(begin, end, back_inserter(v));
  
  ostream_iterator<int> begin_out(cout, " ");

  copy(v.begin(), v.end(), begin_out);

  for (unsigned int i = 0; i < v.size(); ++i)
  {
    v.shift_left();
    cout << endl;
    copy(v.begin(), v.end(), begin_out);
  }
  cout << endl;
  
  return 0;
}