#include<stdio.h>
int main()
{
    int score;
    printf("Your score");
    scanf("%d",&score);
    switch(score/10)
    {
        case 10:
        case 9:printf("Your grade is A\n");break;
        case 8:printf("Your grade is B\n");break;
        case 7:printf("Your grade is C\n");break;
        case 6:printf("Your grade is D\n");break;
        case 5:printf("Your grade is E\n");break;
        case 4:
        case 3:
        case 2:
        case 1:
        default:printf("enter data is error\n");
    }
}