person A: I made in A in all of my classes last semester. I have never done that before. I am really happy with myself. 
person B: Congratulations! That is great_comma_ definitely will help your gpa.  Plan on doing the same this semester?
person A: You bet. I will continue to work hard. The payoff is well worth it.
person B: That's the way to do it_comma_ you will be thankful you did in the long run!