#include <iostream>

using namespace std;

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

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

		if( letterGrade == 'A' || letterGrade == 'a')
			cout << "Your score is 90-100.\n";
		else if (letterGrade == 'B' || letterGrade == 'b')
			cout << "Your score is 80-89.\n";
		else if (letterGrade == 'C' || letterGrade == 'c')
			cout << "Your score is 70-79.\n";
		else if (letterGrade == 'D' || letterGrade == 'd')
			cout << "Your score is 60-69.\n";
		else if (letterGrade == 'E' || letterGrade == 'e')
			cout << "Your score is less than 60...you failed.\n";
	
		cout << "Continue (y/n): ";
		cin >> go;
	}

	return 0;
}