#include<stdio.h>
int main()
{
  // see the solution of wednesday tax problem in case you want marks to be float.
  int marks = 0;
  printf("Enter the marks ");
  scanf("%d",&marks);
  
  int firstDigit = marks / 10;
  int modulo = marks % 10;
  switch(firstDigit)
  {
    case 0 :
    {
      
    }
    case 1 :
    {
      
    }
    case 2 :
    {
      printf("Failed\n");
      break;
    }
    case 3 :
    {
     
    }
    case 4 :
    {
      printf("Grade - D\n");
      break;
    }
    case 5 :
    {
      printf("Grade - C\n");
      break;
    }
    case 6 :
    {
      if(modulo < 5)
	printf("Grade - C\n");
      else
	printf("Grade - B\n");
      
      break;
    }
    case 7 :
    {
      printf("Grade - B\n");
      break;
    }
    case 8 :
    {
      printf("Grade - A\n");
      break;
    }
    case 9 :
    {
      printf("Grade - A\n");
      break;
    }
    case 10 :
    {
      printf("Grade - A\n");
      break;
    }
  }
  
  return 0;
}