#include<stdio.h>
void main ()
/* trying to implement elsei-f condition togather*/

{
  int main()
  int marks;
  printf("enter your marks\n");
  scanf("%d",&marks);
  if (marks >= 90)
      printf("A\n\t\t***good job***");
  else if (marks >= 70)
      printf("B\n");
  else if (marks >= 50)
      printf("C\n");
  else
      printf("fail\n");

       return(0);
}