题解 | #单词倒排#

import java.util.*;
import java.io.*;

// 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) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            String s = br.readLine();
            StringBuffer stb = new StringBuffer();
            boolean flag = false;
            for (int i = 0; i < s.length(); i++) {
                if (Character.isLetter(s.charAt(i))) {
                    flag = false;
                    stb.append(s.charAt(i));
                } else {
                    if (flag == false) {
                        stb.append(" ");
                        flag = true;
                    }
                }
            }
            String[] s1 = stb.toString().split(" ");
            for (int i = s1.length - 1; i >= 0; i--) {
                System.out.print(s1[i]+" ");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}