Update app.py

app.py

@@ -35,7 +35,7 @@ async def optimize_text(prompt: InputPrompt):
 
 def gen(prompt):
     response = client.models.generate_content(
-        model="gemini-flash-lite-latest",
+        model="gemma-3-4b-it",
         contents=prompt,
         config=types.GenerateContentConfig(
             system_instruction=System_instruction,