题解 | #判断是不是字母#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            char c = sc.next().charAt(0);
            if(Character.isLetter(c)){
                System.out.println(c+" is an alphabet.");
            } else {
                System.out.println(c+" is not an alphabet.");
            }
        }
    }
}