#include <iostream>
#include <fstream>
#include <random>

using namespace std;

int main(int argc, char* argv[])
{
  if ( argc != 2 )
  {
    cerr << "ERROR: File argument missing." << endl;
    return 1;
  }

  ofstream ofs(argv[1]);

  if ( ! ofs )
  {
    cerr << "ERROR: File could not be opened." << endl;
    return 1;
  }
  
  random_device rnd;
  uniform_int_distribution<int> dist(0,6);
  
  for ( int i = 0; i < 7*7; ++i )
  {
    int x{ dist(rnd) };
    ofs << x << ' ';
    cout << x << ' ';
  }
  ofs.close();
  
  return 0;
}