题解HJ31 | #单词倒排#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        String s = in.nextLine();

        StringBuilder result = new StringBuilder();

        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) >= 'A' && s.charAt(i) <= 'Z') {
                result.append(s.charAt(i));
            } else if (s.charAt(i) >= 'a' && s.charAt(i) <= 'z') {
                result.append(s.charAt(i));
            } else {
                result.append(" ");
            }
        }

        String[] strings = result.toString().split(" ");

        for (int i = strings.length - 1; i >= 0; i--) {
            System.out.print(strings[i] + " ");
        }
    }
}