Reverse words, symbols do not reverse

This is Baidu's algorithm is a problem, quite simply, no one was doing it, too nervous.

 1 package 单词逆序;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Nixu {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         
10         String string = new String();
11         Scanner in = new Scanner(System.in);
12         
13         string = in.nextLine();
14         
15         String []str = string.split(" ");
16         String danci = new String();
17         String s = new String();
18         for(int i=str.length-1;i>=0;i--)
19         {
20             char []x = str[i].toCharArray();
21             int flag=0;
22             for(int j=0;j<x.length;j++)
23             {
24                 if(x[j]<'A' || x[j]>'z')
25                 {
26                     flag=1;
27                 }
28             }
29             if(flag==0)
30                 danci = danci +str[i]+" ";
31         }
32         
33         for(int i=0;i<str.length;i++)
34         {
35             char []x = str[i].toCharArray();
36             int flag=0;
37             for(int j=0;j<x.length;j++)
38             {
39                 if(x[j]<'A' || x[j]>'z')
40                 {
41                     flag=1;
42                 }
43             }
44             if(flag==1)
45                 s =s +str[i]+" ";
46         }
47         
48         
49         System.out.println(danci+s);
50 
51     }
52 
53 }