杭电 2004

#include <iostream>
using namespace std;
char grand(int);
int main()
{
    int n;
    while (cin>> n)
    {
        if (n>100 || n<0)
        {
            cout << "Score is error!" << endl;
            continue;
        }
        cout<< grand(n)<< endl;
    }
}

char grand(int n)
{
    switch (n/10)
    {
    case 9:
    case 10:
        return 'A';
        break;
    case 8:
        return 'B';
        break;
    case 7:
        return 'C';
        break;
    case 6:
        return 'D';
        break;
    default:
        return 'E';
        break;
    }
}