// Eg12-7.cpp
#include <fstream>
#include <iostream>
using namespace std;
int main() {
  char ch;
  ofstream out("/test.dat", ios::out | ios::binary); // L1
  for (int i = 0; i < 90; i++) {
    if (i > 0 && (i % 30) == 0)
      out.put('\n');
    out.put(i);
    out.put(' ');
  }
  out.close();
  ifstream in("/test.dat", ios::in | ios::binary);
  while (in.get(ch))
    cout << ch;
  in.close();
  
}