#include <iostream>

using namespace std;

int main()
{
	char go = 'y';
	char letterGrade;

	while(tolower(go) == 'y')
	{
		cout << "Input your letter grade: ";
		cin >> letterGrade;

		if (toupper(letterGrade) == 'A') 
			cout << "Your score is 90-100.\n";
		else if (toupper(letterGrade) == 'B')
			cout << "Your score is 80-89.\n";
		else if (toupper(letterGrade) == 'C')
			cout << "Your score is 70-79.\n";

		cout << "Continue (y/n): ";
		cin >> go;
	}

	return 0;
}