include

using namespace std;

int main() {
int grade;

cout << "Введите оценку (от 1 до 12): ";
cin >> grade;
switch (grade) {
case 1:
case 2:
case 3:
cout << "Уровень F" << endl;
break;
case 4:
case 5:
cout << "Уровень D" << endl;
break;
case 6:
case 7:
cout << "Уровень C" << endl;
break;
case 8:
case 9:
cout << "Уровень B" << endl;
break;
case 10:
case 11:
case 12:
cout << "Уровень A" << endl;
break;
default:
cout << "Неверная оценка" << endl;
}
return 0;

}