comprogzz coding

import java.io.*;
             class General20{
               public static void main(String args[])throws IOException
                  {
                     int n;
                      InputStreamReader isr=new InputStreamReader(System.in);
                      BufferedReader br=new BufferedReader(isr);
                     do{
                      System.out.println("Enter a number");
                      n=Integer.parseInt(br.readLine());
                     }while(n<=9);
                     for(int i=9;i>=1;i--)
                    {
                    int a=n;
                    while(a>0){
                     int b=a%10;
                      if (b==i)
                      System.out.print(b+" ");
                       a/=10;
                      }
                    }
                  }
            }