#include <iostream>
int asking();
void perf(int a);
void result(int j);

int main() {
	int score = asking();
	result(score);
	perf(score);
	system("pause");
	return 0;
}

int asking() {
	int x;
	bool valid = true;

	while (valid) {
		std::cout << "What was your Score?\n";
		std::cin >> x;
		if (x >= 0 && x < 101) {
			valid = false;
		}
		else {
			std::cout << "The Score must be between 0 and 100!\n";
		}
	}
	return x;
}
void result(int i) {
	if (i<101 && i>89) {
		std::cout << "A Score!\n";
	}
	else if (i < 90 && i>79) {
		std::cout << "B Score!\n";
	}
	else if (i < 80 && i>69) {
		std::cout << "C Score!\n";
	}
	else if (i < 70 && i>59) {
		std::cout << "D Score!\n";
	}
	else if (i < 60 && i >= 0) {
		std::cout << "F Score!\n";
	}
	else {
		std::cout << "Invalid Score! (0-100)\n";
	}
}
void perf(int j) {
	if (j == 100) {
		std::cout << "Perfect Score!\n";
	}
	else {
		std::cout << " ";
	}
}