#include <stdio.h>
int main() {
int score = 0;
scanf("%d", &score);
if(score > 100)
{
printf("F");
}
else if(score >= 90)
{
printf("A");
}
else if(score >= 80)
{
printf("B");
}
else if(score >= 70)
{
printf("C");
}else if(score >= 60)
{
printf("D");
}
else if(score >= 0)
{
printf("E");
}
else
{
printf("F");
}
return 0;
}
#include <stdio.h>
int main() {
int score = 0;
scanf("%d", &score);
if(score >= 0)
{
switch (score / 10)
{
case 10:
case 9:
printf("A");
break;
case 8:
printf("B");
break;
case 7:
printf("C");
break;
case 6:
printf("D");
break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:
printf("E");
break;
default:
printf("F");
break;
}
}
else
{
printf("F");
}
return 0;
}