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 in = new Scanner(System.in);
        String s = in.nextLine();
        String[] chr = s.split("[^a-zA-Z]");
        StringBuilder res = new StringBuilder();
        for(int i = chr.length-1; i >= 0; i--){
            res.append(chr[i]+" ");
        }
        System.out.println(res.toString().trim());
    }
}