자바 문제 풀이 5

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main{

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String str = br.readLine();
        int score = Integer.parseInt(str);

        System.out.println((score >= 90)?"A" : (score >= 80)?"B" : (score >= 70)?"C" : (score >= 60)?"D" : "F");
    }
}