I notice you have recently posted four topics, and we certainly encourage the posting of questions. However, let me offer you a bit of advice:
You are most likely going to get help more quickly if you show what you have done so far, or at least give some thoughts about how you think you should proceed. It is much easier for our contributors to know just exactly where you need help if you do this, and it shows that you are attempting to gain a better understanding of the material rather than just asking for your work to be done.
I'm not saying at all that this is what you are doing, however, it may appear to others that this is the case when you merely state the problem, and do not demonstrate any effort on your part.
I offer this advice to help you get the best and most timely help possible.
Hi ianchenmu! Welcome to MHB!
Hello, and welcome to MHB, ianchenmu!