class RafDemo
{
    public static void main(String args[])
    {
        try{
                 RandomAccessFile raf = new RandomAccessFile(args[0],"r");
                 long count =Long.valueof(args[1]).longValue(); //what's mean?
                 long position = raf.length();
                 position-=count;
                 if(position<0)   
                       position=0;
                 raf.seek(position);
                 while(true)
                 {
                        try
                        {
                                  byte b = raf.readByte();
                                  System.out.print((char)b);
                                 
                         }catch(EOFException eofe)
                          {
                                   break;
                           }
                  }
             }catch(Exception e)
               {
                     e.printStackTrace();
               }
    }
}