题解 | #判断是不是字母#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String str;
        while((str=bf.readLine()) != null){
        char input = str.charAt(0);
        if( input >='A' && input <='Z' || input>='a' && input <= 'z'){
            System.out.println(input+" is an alphabet.");
        }else{
            System.out.println(input+" is not an alphabet.");
            }
        }
    }
}