import java.io.*; 
  
public class Grades 
{ 
  public static void main(String[] argv) throws Exception 
  { 
    BufferedReader cin; 
    cin = new BufferedReader(new InputStreamReader(System.in)); 
  
    char grade; 
    System.out.print("What is your grade? [A, B, C, D, or F]: "); 
    grade = cin.readLine().charAt(0); 
  
    if (grade == 'A') 
      System.out.println("Excellent"); 
    else if (grade == 'B') 
      System.out.println("Good"); 
    else if (grade == 'C') 
      System.out.println("Average"); 
    else if (grade == 'D' || grade == 'F') 
      System.out.println("See you next year"); 
    else 
      System.out.println("Invalid: " + grade); 
  } 
}