#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <fstream>
#include <vector>
#include <string>
using namespace std;

int main()
{
  ifstream fin;   // declare an input file stream
  string file_name, out_stream;
  double x;

  cout << "Enter file name: ";
  cin >> file_name;

  // open file file_name for input
  fin.open(file_name.c_str(), ios::in);  

  // check if file is opened for input
  if (!fin.is_open())
    {
      cerr << "Unable to open file " << file_name << endl;
      exit(10);
    }

  // read text from file
  vector<double> v;
  fin >> x;
  while (!fin.eof() && !fin.fail()) {
      v.push_back(x);
      fin >>x;
    }

  if (!fin.eof() && fin.fail()) {
      cerr << "Error reading file " << file_name << endl;
      exit(20);
    }

  else if (fin.eof() && !fin.fail()) {
      v.push_back(x);
    }

  // close file stream fin
  fin.close();

  //sort vector
  sort(v.begin(), v.end());

  cout << v <<endl;
  return 0;

  //Step6?

  ofstream fout;

  // open file file_name for output
  // out_stream.c_str() returns a C style string
  fout.open(out_stream.c_str(), ios::out);

  // check if file is opened for output
  if (!fout.is_open())
    {
      cerr << "Unable to open file " << file_name << endl;
      exit(10);
    }

  // write vector to file
  fout<< v <<endl;

  // close file stream fout
  fout.close();

  return 0;
}