#include<stdio.h>

int main()
{
   printf("It is a program about grading\n");
   int a;
   printf("Enter the acquiring number of a student:");
   scanf("%d",&a);
   if(a>=80&&a<=100)
        printf("\nyour grade is=A+\n");
   else if(a>=75&&a<80)
        printf("\nyour grade is=A\n");
   else if(a>=70&&a<75)
        printf("\nyour grade is=A-\n");
   else if(a>=65&&a<70)
        printf("\nyour grade is=B+\n");
   else if(a>=60&&a<65)
        printf("\nyour grade is=B-\n");
   else if(a>=50&&a<60)
        printf("\nyour grade is=c\n");
   else if(a>=40&&a<50)
        printf("\nyour grade is=D\n");
    else if(a>100||a<0)
        printf("Invalid intput");
   else
        printf("\nIt is sorry to you that you fail\n");

   return 0;

}