1public class Main {
2    public static void main(String[] args) {
3        int score = 72;
4        if (score >= 90) {
5            System.out.println("A");
6        } else if (score >= 80) {
7            System.out.println("B");
8        } else if (score >= 70) {
9            System.out.println("C");
10        } else {
11            System.out.println("F");
12        }
13    }
14}