import org.apache.commons.lang.RandomStringUtils;  
  
public 
class DummyFileHelper {  
    //private final static String RAMDOM_SOURCE = "0123456789"; 
	private final static String RAMDOM_SOURCE = "0123456789025689";  
  
    public static void main(String[] args) throws IOException {  
    	String randomNumber=RandomStringUtils.random(6, RAMDOM_SOURCE);
    	System.out.println(randomNumber);
    }  
}