题解 | #单词倒排#

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String line = scan.nextLine();
        int sign = 0;
        int end = 0;
        char[] chrs = line.toCharArray();
        StringBuffer sb = new StringBuffer("");
        for (int i = chrs.length - 1; i > -1; i--) {
            char chr = chrs[i];
            if ((chr >= 'a' && chr <= 'z') || (chr >= 'A' && chr <= 'Z')) {
                if (sign == 0) {
                    sign = 1;
                    end = i + 1;
                }
            } else {
                if (sign == 1) {
                    sign = 0;
                    sb.append(line.substring(i + 1, end));
                    sb.append(" ");
                }
            }
        }
        if (sign == 1) {
            sb.append(line.substring(0, end));
        }
        System.out.println(sb);
    }
}