1 #include<cstdio>
 2 int main()
 3 {
 4     int m;
 5     while(scanf("%d",&m)==1)
 6     {
 7         if(m<0||m>100){printf("Score is error!\n");continue;}
 8         switch(m/10)
 9         {
10             case 10:case 9:printf("A\n");break;
11             case 8:printf("B\n");break;
12             case 7:printf("C\n");break;
13             case 6:printf("D\n");break;
14             default:printf("E\n");break;
15         }
16     }
17     return 0;
18 }