Update app.py

app.py

@@ -36,7 +36,7 @@ YOUTUBE_URL = "https://www.youtube.com/watch?v=--khbXchTeE"
 MODEL_NAME  = "gpt-4"
 
 def invoke(openai_api_key, use_rag, prompt):
-    print("=>"+os.listdir("./"))
+    print(os.listdir("./"))
     llm = ChatOpenAI(model_name = MODEL_NAME, 
                      openai_api_key = openai_api_key, 
                      temperature = 0)