题解 | #判断是不是字母#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNext()) {
            char letter = scanner.next().charAt(0);
            if((letter >= 'A' && letter <= 'Z') || (letter >= 'a' && letter <= 'z')) {
                System.out.println(letter + " is an alphabet.");
            } else {
                System.out.println(letter + " is not an alphabet.");
            }
        }
    }
}