To provide you with accurate answers, I would need to visualize the specific coordinate graph that Marcelle is using. Since I can't see the graph you are referring to, I can't provide the coordinates for each letter of the word "FIST" as represented on that graph.
However, if you provide the coordinates for each letter of the word "FIST" based on the graph, I can assist you with part (b), which involves changing the first letter.
Once I have the necessary details, I'll be able to help you further!