题解 | #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 scanner = new Scanner(System.in);
        String string = scanner.nextLine();
        StringBuilder res = new StringBuilder();

        char[] array = string.toCharArray();
        int right = array.length - 1;
        int left = right;
        while (left >= 0){
            while (Character.isLetter(array[left])){
                left--;
                if (left == -1){
                    break;
                }
            }
            if (left == -1){
                res.append(string.substring(0,right + 1));
                break;
            }
            res.append(string.substring(left + 1,right + 1) + " ");
            if (left == 0){
                break;
            }
            while (!Character.isLetter(array[left])){
                left--;
            }
            right = left;
        }
        System.out.println(res);
    }
}