#include <iostream>

using namespace std;

int main()
{
	int testScore ;
	cout << "Enter your test score and I will tell you\n";
	cout << "the letter grade you earned: ";
	cin >> testScore;
	if (testScore < 60)
	 cout << "Your grade is F.\n";
	else if (testScore < 70)
	 cout << "Your grade is D.\n";
	else if (testScore < 80)
	 cout << "Your grade is C.\n";
	else if (testScore < 90)
	 cout << "Your grade is B.\n";
	else if (testScore <= 100)
	 cout << "Your grade is A.\n";
	return 0;
}