#include <stdio.h>

int main (void) {
  char grade;
  scanf ("%c", &grade);
  switch (grade) {
    case 'A': printf("Excellent"); 
      break;
    case 'B': printf("Good"); 
      break;
    case 'C': printf("Average"); 
      break;
    case 'D': printf("Fair"); 
      break;
    default: printf("Invalid grade"); 
  }
  return 0;
}