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()) {
            String str = sc.next();
            int c = (int)str.charAt(0);
            if((c >= 65 && c <= 90) || (c >= 97 && c <= 122)) {
                System.out.println(str.charAt(0) + " is an alphabet.");
            } else {
                System.out.println(str.charAt(0) + " is not an alphabet.");
            }
        }
    }
}