#include <stdio.h>

int main(void) {
  int grade7;
  
  /* Prompt for input */
  printf("Enter Danish 7 step grade: ");
  scanf("%d", &grade7);

  /* Find and print the corresponding ECTS grade */
  printf("The corresponding ECTS grade is: ");
  switch(grade7){
    case 12: 
      printf("A"); break;
    case 10: 
      printf("B"); break;
    case 7: 
      printf("C"); break;
    case 4: 
      printf("D"); break;
    case 2: 
      printf("E"); break;
    case 0: 
      printf("Fx"); break;
    case -3: 
      printf("F"); break;
    default: 
      printf("Illegal");
  }
  printf("\n");
  
  return 0;
}