9498. 시험 성적

어렵다기보다 귀찮은 문제.

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		int scr = sc.nextInt();
		
		if (scr<=100 && scr>=90) {
			System.out.println("A");
		}
		else if (scr<90 && scr>=80) {
			System.out.println("B");
		}
		else if (scr<80 && scr>=70) {
			System.out.println("C");
		}
		else if (scr<70 && scr>=60) {
			System.out.println("D");
		}
		else {
			System.out.println("F");
		}
	}

}