题解 | #单词倒排#

import java.util.*;

// 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 line = in.nextLine();
    // regex
    line = line.replaceAll("[^A-Za-z]+", " ").trim();
    // reverse
    List<String> list = Arrays.asList(line.split(" "));
    Collections.reverse(list);
    
    System.out.println(String.join(" ", list));
  }
}