#include <iostream>
#include <cctype>

using namespace std;

int main() {
  char x = 0;

  do {
    cout << "Please enter a character: " << endl;
    cin >> x;

    switch(toupper(x)) {
      case('A'): cout << "A is the first letter of the alphabet." << endl;
                 break;
      case('Z'): cout << "Z is the last letter of the alphabet." << endl;
                 break;
      case('Q'): cout << "Good bye." << endl;
                 break;
      default:   cout << x << " is not A or Z." << endl;
    }
  } while(toupper(x) != 'Q');
  return 0;
}