Simple. First, you put something in the machine that you would like to put in there. (like pancakes). Then the person below would say something related to the thing you put in there, like, (you get syrup). Then that person would start again with the "I would put in" part. This is what it should look like.
Person #1: I put in cookies
Person #2: You get milk. I put in a pokeball.
Person #3: You get a pokemon. (ect., ect.,....)
Sound simple? Okay! Lets begin!
Lets start with ... I put in cheese.