#include <stdio.h>


int main(int argc, char **argv){

     char grade = 'F'; 
     if (argc > 1) grade = argv[1][0] ;

     printf("You entered grade %c\n\n", grade);    

     switch( grade ){

         case 'A':
         case 'a':
           printf("Excellent\n");
           break;

         case 'B':
         case 'b':
           printf("Good\n");
           break;

         case 'C':
         case 'c':
           printf("Fair\n");
           break;

         default:
           printf("Fail\n");

    }
    return 0;
}