1  #include <iostream>
 2  using namespace std;
 3
 4  void read(){ cout << "read()\n";}
 5  void sort(){ cout << "sort()\n";}
 6  void compact(){ cout << "compact()\n";}
 7  void write(){ cout << "write()\n";}
 8
 9  int main(){
10          read();
11          sort();
12          compact();
13          write();
14
15          return 0;
16  }
17