#include<iostream>
using namespace std;

int main()
{
    int score;
    cout << "Enter Score: ";
    cin >> score;
    
    if (score >= 0 && score <= 100)
    {
       cout <<" Grade = ";
       switch (score/10 )
       {
           case 10 : 
           case  9 : cout << "A"; break;
           case  8 : cout << "B"; break;
           case  7 : cout << "C"; break;
           case  6 : cout << "D"; break;
           default :  cout << "F";
       }
     }
     else
        cout <<" Bad input ";
    cout <<endl;
   
    system("pause");
    return 0;
}