import java.io.*; /* * if 语句基础题 * */ public class Main { public static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out)); public static StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in))); public static PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out)); public static void main(String[] args) throws Exception { cin.nextToken(); int x = (int) cin.nval; if (x >= 90) { cout.println("A"); } else if (x >= 80 && x < 90) { cout.println("B"); } else if (x >= 70 && x < 80) { cout.println("C"); } else if (x >= 60 && x < 70) { cout.println("D"); } else { cout.println("E"); } cout.flush(); } }
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