题解 | #单词倒排#

import java.io.BufferedReader;
import java.io.InputStreamReader;

// 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) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String s = br.readLine().trim();

        char[] c = s.toCharArray();

        StringBuilder sb = new StringBuilder();
        for(int i = 0;i < c.length;i++){
            if((c[i] >= 'a' && c[i] <= 'z') || (c[i] >= 'A' && c[i] <= 'Z')){
                sb.append(c[i]);
            }else{
                sb.append(' ');
            }
        }

        String str = sb.toString();

        String res = str.replaceAll(" +"," ");
        String[] words = res.split(" ");

        for(int i = words.length - 1;i >= 0; i--){
            System.out.print(words[i]);
            if(i != 0){
                System.out.print(' ');
            }
        }
    }
}