import java.io.*;
 
public class GradeSwitch
{
  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);

 
    switch (grade)
    {  // start here with switch OFF
      case 'A':  // if grade is 'A', turn switch ON
      case 'a':  // if grade is 'a', turn switch ON
        System.out.println("Excellent");  // do this if switch is ON
        break;  // skip to closing curly-brace if switch is ON
      case 'B':  // if grade is 'B', turn switch ON  
      case 'b':  // if grade is 'b', turn switch ON  
        System.out.println("Good");  // do this if switch is ON  
        break;  // skip to closing curly-brace if switch is ON
      case 'C':  // if grade is 'C', turn switch ON  
      case 'c':  // if grade is 'c', turn switch ON  
        System.out.println("Average");  // do this if switch is ON  
        break;  // skip to closing curly-brace if switch is ON
      case 'D':  // if grade is 'D', turn switch ON  
      case 'F':  // if grade is 'F', turn switch ON  
      case 'd':  // if grade is 'd', turn switch ON  
      case 'f':  // if grade is 'f', turn switch ON  
        System.out.println("See you next year");  // do this if switch is ON  
        break;  // skip to closing curly-brace if switch is ON
      default:  // turn switch ON  
        System.out.println("Invalid: " + grade);  // do this if switch is ON  
    }  // this is the closing curly-brace  
  }    
}