#include <iostream.h>

main()
{
  char grade;
  cout << "Grade: ";
  cin >> grade;

  switch (grade) {
  case 'A': case 'B':
    cout << "Good!" << endl;
    break;
  case 'C':
    cout << "Average." << endl;
    // One break statement is missing here.
  case 'D':
    cout << "Fair." << endl;
    break;
  case 'F':
    cout << "Poor." << endl;
    break;
  default:
    cout << "Invalid grade!" << endl;
  }

  return 0;
}