>>> You should always use trimmed, interleaved, bottom-posting. See, how I have quoted your message, and replied below it (similar to how you answer below a question in an exam).
Sure, i got it, SK. thanks. 

You might also want to refer:
  https://en.wikipedia.org/wiki/Posting_style#Placement_of_replies
  http://www.shakthimaan.com/downloads/glv/presentations/mailing-list-etiquette.pdf