#include <stdio.h>

int main() {
int marks;
scanf("%d",&marks);
if(marks>=90 && marks<=100);{
    printf("o grade");
}
    else if(marks>=80&&marks<90);
    {printf("A+ grade");
}
else if(marks>=70&&marks<80);{
    printf("a grade");}
    else{printf("fail");}
return 0;
}