#include<stdio.h>
struct student
{
int m1,m2,m3,m4;
}st;
int main()
{
int total,avg;
printf("enter 4 subject marks\n");
scanf(%d %d %d %d",&m1,&m2,&m3,&m4);
total=m1+m2+m3+m4;
avg=total/4;
if(avg>=70&&avg<=100)
printf("A GRADE");
if(avg>=60&&avg<=69)
printf("B GRADE");
if(avg>=50&&avg<=59)
printf("C GRADE");
if(avg>=40&&avg<=49)
printf("E GRADE");
if(avg>=0&&avg<=39)
printf("FAIL");