public class NFilter
{
  private StringBuffer buffer;
  private Read reader;
   
  public NFilter(Read read)
    {
      String temp;
      reader = read;
      if(null == (temp = reader.read(10)))
        {
          System.out.println("NULL");
          buffer = null;return;
        }

      buffer = new StringBuffer(temp);
    }
  
  public String next()
    {
       
      String temp = null;
      
      if(buffer == null){System.out.println("NULL");return null;}

      
      if(9 < buffer.length()){
          temp = buffer.substring(0,9);
        }
      else if(buffer.length() != 0)
        {
          temp =buffer.substring(0,buffer.length());
        }
      else
        {
          temp = null;
          return temp;
        }

      
      String temp00;
      buffer.delete(0,1);
      if((temp00 = reader.read(1))!= null)
      {
        buffer.append(temp00);
      }
      
      return temp;
      
    }
}