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 sc = new Scanner(System.in);
        String in = sc.nextLine();
        char[] chars = in.toCharArray();
	  //将所有非字母的字符转换成空格
        for (int i = 0; i < chars.length; i++) {
            if (chars[i]<'A'||chars[i]>'z'||(chars[i]>'Z'&&chars[i]<'a')){
                chars[i]=' ';
            }
        }
        String str = new String(chars);
        String[] s = str.split(" ");
        for (int i = s.length-1; i >=0; i--) {
            System.out.print(s[i]);
            System.out.print(" ");
        }
    }
}