题解 | #判断是不是字母#

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;
        while ((str = br.readLine()) != null ) {
            char c = str.charAt(0);
            boolean b = Character.isLetter(c);//根据判断输出两种结果
            String s = b ? " is an alphabet." : " is not an alphabet.";
            System.out.println(c + s);

        }
    }
}